CCEA AS-Level · thinka 原创模拟试题

2025 CCEA AS-Level Music 7010 模拟试题及答案详解

Thinka Jun 2025 CCEA AS Level-Style Mock — Music 7010

70 120 分钟2025
An original Thinka practice paper modelled on the structure and difficulty of the Jun 2025 CCEA AS Level Music 7010 paper. Not affiliated with or reproduced from CCEA.

甲部: 必答 Area of Study (Music for Orchestra, 1700–1900)

Answer all parts of Question 1 using the provided score insert for the prescribed orchestral set work.
7 题目 · 20
题目 1 · Motivic Development & Melodic Features
3
Section A: The score insert shows an original extract, in the style of the rondo theme from the third movement (Allegro giocoso, ma non troppo vivace) of Brahms's Violin Concerto in D, Op. 77. The solo violin opens (bars 1–4) with a short, rising three-note motif, D–F♯–A, in a dotted rhythm, marked forte. This motif reappears twice more: first, in bars 5–8, a step higher (E–G♯–B), immediately followed by a rapid descending scalic flourish; and then, in bars 9–12, decorated with double-stopped thirds beneath a sustained final note.
Describe how the opening three-note violin motif is developed when it reappears for the SECOND time (bars 5–8).
查看答案详解

解题

The motif reappears as a melodic sequence, transposed up one step from D–F♯–A to E–G♯–B [1], retaining its original dotted rhythm [1]; it is then extended by a rapid descending scalic flourish added immediately after the motif [1].
Final answer: the motif is repeated as a rising sequence (a step higher, E–G♯–B) and extended with an added descending scale passage.

评分标准

[3] 1 mark: correctly identifies transposition/sequence up a step; 1 mark: correct new pitch level (E–G♯–B) or correct reference to the dotted rhythm being retained; 1 mark: identifies the added descending scalic flourish as the extension/development.
题目 2 · Motivic Development & Melodic Features
3
Section A: The score insert shows an original extract, in the style of the rondo theme from the third movement (Allegro giocoso, ma non troppo vivace) of Brahms's Violin Concerto in D, Op. 77. The solo violin opens (bars 1–4) with a short, rising three-note motif, D–F♯–A, in a dotted rhythm, marked forte. This motif reappears twice more: first, in bars 5–8, a step higher (E–G♯–B), immediately followed by a rapid descending scalic flourish; and then, in bars 9–12, decorated with double-stopped thirds beneath a sustained final note.
Describe TWO ways in which the motif is developed when it reappears for the THIRD time (bars 9–12).
查看答案详解

解题

1. The motif is decorated with double-stopping, the soloist adding thirds beneath the melody notes, thickening the texture and adding virtuosic brilliance [1–2 marks depending on detail].
2. The final note of the motif is sustained/held rather than moving straight on, creating a sense of arrival or climax at this point in the extract [1 mark].
Final answer: the motif is developed by (1) adding double-stopped thirds beneath the melody, and (2) ending with a sustained/held final note that creates a sense of arrival.

评分标准

[3] Up to 2 marks for identifying and describing the double-stopping in thirds (1 mark for double-stopping identified, 1 further mark for detail e.g. in thirds/adding textural richness); 1 mark for identifying the sustained/held final note and its effect (sense of arrival/climax).
题目 3 · Harmonic & Inversion Grid (4 chords)
8
Section A: The score insert shows an original extract, in the style of the rondo theme from the third movement (Allegro giocoso, ma non troppo vivace) of Brahms's Violin Concerto in D, Op. 77. The solo violin opens (bars 1–4) with a short, rising three-note motif, D–F♯–A, in a dotted rhythm, marked forte. This motif reappears twice more: first, in bars 5–8, a step higher (E–G♯–B), immediately followed by a rapid descending scalic flourish; and then, in bars 9–12, decorated with double-stopped thirds beneath a sustained final note.
The table below gives the notes sounding in four chords from bars 20–23 of the extract (lowest-sounding note listed first).
Bar / Notes sounding (bass note first)
20 / D, F♯, A
21 / G, B, D
22 / A, C♯, E, G
23 / F♯, A, D

For EACH bar, identify the chord (using its letter name, e.g. 'D major') and its position (root position, first inversion, second inversion, or — for a 7th chord — third inversion). [8]
查看答案详解

解题

Bar 20: the notes D, F♯, A form a D major triad (root D, third F♯, fifth A); with D in the bass, this is root position.
Bar 21: the notes G, B, D form a G major triad; with G in the bass, this is root position (chord IV in D major).
Bar 22: the notes A, C♯, E, G form an A major triad (A–C♯–E) with an added minor seventh (G), i.e. A dominant seventh (A7, chord V7 in D major); with the root A in the bass, this is root position.
Bar 23: the notes F♯, A, D are the same pitch classes as the D major triad (D, F♯, A); with F♯ (the third) in the bass, this is first inversion.
Final answer: Bar 20 = D major, root position; Bar 21 = G major, root position; Bar 22 = A7 (dominant 7th), root position; Bar 23 = D major, first inversion.

评分标准

[8] Marked as 2 marks per bar (1 for the correct chord name, 1 for the correct position/inversion): Bar 20 – D major [1], root position [1]; Bar 21 – G major [1], root position [1]; Bar 22 – A7/A dominant seventh [1], root position [1]; Bar 23 – D major [1], first inversion [1]. Accept enharmonic/alternative correct labelling of chord quality.
题目 4 · Harmonic / Structural Device & Key Identification
2
Section A: The score insert shows an original extract, in the style of the rondo theme from the third movement (Allegro giocoso, ma non troppo vivace) of Brahms's Violin Concerto in D, Op. 77. The solo violin opens (bars 1–4) with a short, rising three-note motif, D–F♯–A, in a dotted rhythm, marked forte. This motif reappears twice more: first, in bars 5–8, a step higher (E–G♯–B), immediately followed by a rapid descending scalic flourish; and then, in bars 9–12, decorated with double-stopped thirds beneath a sustained final note.
Identify the harmonic device (cadence) formed by chord V7 resolving to chord I at the end of the extract (bars 22–23).
查看答案详解

解题

The dominant seventh chord (V7) resolving to the tonic chord (I) is a perfect cadence (also called an authentic cadence).
Final answer: perfect cadence.

评分标准

[2] 1 mark: perfect cadence (accept 'authentic cadence'); 1 mark: correct reference to V7 (or V) moving to I / dominant to tonic.
题目 5 · Harmonic / Structural Device & Key Identification
1
Section A: The score insert shows an original extract, in the style of the rondo theme from the third movement (Allegro giocoso, ma non troppo vivace) of Brahms's Violin Concerto in D, Op. 77. The solo violin opens (bars 1–4) with a short, rising three-note motif, D–F♯–A, in a dotted rhythm, marked forte. This motif reappears twice more: first, in bars 5–8, a step higher (E–G♯–B), immediately followed by a rapid descending scalic flourish; and then, in bars 9–12, decorated with double-stopped thirds beneath a sustained final note.
Identify the key of the extract shown in bars 20–23.
查看答案详解

解题

All four chords (D major, G major, A7, D major) belong to the key of D major, the home key of the movement.
Final answer: D major.

评分标准

[1] D major.
题目 6 · Harmonic / Structural Device & Key Identification
2
Section A: The score insert shows an original extract, in the style of the rondo theme from the third movement (Allegro giocoso, ma non troppo vivace) of Brahms's Violin Concerto in D, Op. 77. The solo violin opens (bars 1–4) with a short, rising three-note motif, D–F♯–A, in a dotted rhythm, marked forte. This motif reappears twice more: first, in bars 5–8, a step higher (E–G♯–B), immediately followed by a rapid descending scalic flourish; and then, in bars 9–12, decorated with double-stopped thirds beneath a sustained final note.
The rondo theme's dotted rhythms and drone-like sustained bass notes are characteristic of a folk-influenced style associated with this movement. Name this style.
查看答案详解

解题

This dotted-rhythm, folk-dance character is described as alla zingarese, meaning 'in the gypsy (Hungarian) style' — a style Brahms used in several works, including this concerto's finale, partly through his association with the Hungarian-influenced violinist Joseph Joachim.
Final answer: alla zingarese (Hungarian/gypsy style).

评分标准

[2] 1 mark: reference to gypsy/Hungarian style; 1 mark: the term 'alla zingarese' given, or a clear correct description of the style.
题目 7 · Harmonic / Structural Device & Key Identification
1
Section A: The score insert shows an original extract, in the style of the rondo theme from the third movement (Allegro giocoso, ma non troppo vivace) of Brahms's Violin Concerto in D, Op. 77. The solo violin opens (bars 1–4) with a short, rising three-note motif, D–F♯–A, in a dotted rhythm, marked forte. This motif reappears twice more: first, in bars 5–8, a step higher (E–G♯–B), immediately followed by a rapid descending scalic flourish; and then, in bars 9–12, decorated with double-stopped thirds beneath a sustained final note.
State the overall musical form of the third movement of Brahms's Violin Concerto in D, from which this extract is taken.
查看答案详解

解题

The third movement is in rondo form, built around the recurring theme heard at the opening of this extract, alternating with contrasting episodes.
Final answer: rondo (form).

评分标准

[1] rondo (form).

准备好测试自己了吗?

将这些笔记转化为考试练习。获取此课题的无限AI题目,即时批改及详细解析。

练习此课题

乙部: Unfamiliar Score Analysis

Answer all parts of Question 2 using the provided score insert for the unfamiliar score.
7 题目 · 20
题目 1 · Melodic & Developmental Features Identification
3
Section B: The score insert shows an original, unfamiliar extract from the opening of the first movement of a Classical-era piano sonata, marked Allegro, in 3/4 time and the key of C major. The right-hand melody begins (bars 1–4) with a rising broken-chord (arpeggio) figure outlining a C major triad, C–E–G–C, played staccato, followed by a stepwise descending scale passage back down to the tonic. This opening idea is then repeated in bars 5–8, but with the third note now decorated by a turn ornament, and ending with a rising sequence instead of returning to the tonic.
Identify THREE melodic features of the opening idea in bars 1–4.
1. [1] 2. [1] 3. [1]
查看答案详解

解题

1. The melody opens with a rising broken-chord (arpeggio) figure outlining the tonic triad.
2. It is played staccato.
3. It closes with a stepwise descending scale passage back to the tonic.
Final answer: rising arpeggio/broken-chord opening; staccato articulation; closing stepwise descending scale.

评分标准

[3] 1 mark each for any three of: rising broken-chord/arpeggio figure; outlines the tonic triad; staccato articulation; closing stepwise/scalic descent back to the tonic. All other valid features credited.
题目 2 · Melodic & Developmental Features Identification
4
Section B: The score insert shows an original, unfamiliar extract from the opening of the first movement of a Classical-era piano sonata, marked Allegro, in 3/4 time and the key of C major. The right-hand melody begins (bars 1–4) with a rising broken-chord (arpeggio) figure outlining a C major triad, C–E–G–C, played staccato, followed by a stepwise descending scale passage back down to the tonic. This opening idea is then repeated in bars 5–8, but with the third note now decorated by a turn ornament, and ending with a rising sequence instead of returning to the tonic.
Describe how the opening idea is developed when it returns in bars 5–8.
查看答案详解

解题

The opening idea is restated in essentially the same form, keeping its rising arpeggio shape and staccato character [1–2], but is now decorated with the addition of a turn ornament on the third note [1]; rather than closing with the same descending scale back to the tonic, the phrase now ends with a rising sequence, avoiding a return to the tonic and creating forward momentum into the next section [1].
Final answer: the idea is restated with the same basic shape, decorated with a turn ornament on the third note, and its ending changed to a rising sequence instead of resolving back to the tonic.

评分标准

[4] Up to 2 marks: correctly identifies the phrase is restated/repeated in a similar shape; 1 mark: identifies the added turn ornament on the third note; 1 mark: identifies the changed ending (rising sequence instead of returning to the tonic).
题目 3 · Harmonic & Inversion Grid (4 chords)
8
Section B: The score insert shows an original, unfamiliar extract from the opening of the first movement of a Classical-era piano sonata, marked Allegro, in 3/4 time and the key of C major. The right-hand melody begins (bars 1–4) with a rising broken-chord (arpeggio) figure outlining a C major triad, C–E–G–C, played staccato, followed by a stepwise descending scale passage back down to the tonic. This opening idea is then repeated in bars 5–8, but with the third note now decorated by a turn ornament, and ending with a rising sequence instead of returning to the tonic.
The table below gives the notes sounding in four chords from bars 9–12 of the extract (lowest-sounding note listed first).
Bar / Notes sounding (bass note first)
9 / C, E, G
10 / F, A, C
11 / D, F, G, B
12 / C, E, G

For EACH bar, identify the chord (using its letter name, e.g. 'C major') and its position (root position, first inversion, second inversion, or — for a 7th chord — third inversion). [8]
查看答案详解

解题

Bar 9: the notes C, E, G form a C major triad; with C in the bass, this is root position (chord I).
Bar 10: the notes F, A, C form an F major triad; with F in the bass, this is root position (chord IV).
Bar 11: the notes G, B, D, F form a G major triad (G–B–D) with an added minor seventh (F), i.e. G dominant seventh (G7, chord V7); the fifth of the chord, D, is in the bass, so this is second inversion.
Bar 12: the notes C, E, G form a C major triad again; with C in the bass, this is root position (chord I).
Final answer: Bar 9 = C major, root position; Bar 10 = F major, root position; Bar 11 = G7 (dominant 7th), second inversion; Bar 12 = C major, root position.

评分标准

[8] Marked as 2 marks per bar (1 for the correct chord name, 1 for the correct position/inversion): Bar 9 – C major [1], root position [1]; Bar 10 – F major [1], root position [1]; Bar 11 – G7/G dominant seventh [1], second inversion [1]; Bar 12 – C major [1], root position [1].
题目 4 · Key, Device and Dance Style Identification
1
Section B: The score insert shows an original, unfamiliar extract from the opening of the first movement of a Classical-era piano sonata, marked Allegro, in 3/4 time and the key of C major. The right-hand melody begins (bars 1–4) with a rising broken-chord (arpeggio) figure outlining a C major triad, C–E–G–C, played staccato, followed by a stepwise descending scale passage back down to the tonic. This opening idea is then repeated in bars 5–8, but with the third note now decorated by a turn ornament, and ending with a rising sequence instead of returning to the tonic.
Identify the key of the extract shown in bars 9–12.
查看答案详解

解题

All four chords (C major, F major, G7, C major) belong to the key of C major.
Final answer: C major.

评分标准

[1] C major.
题目 5 · Key, Device and Dance Style Identification
1
Section B: The score insert shows an original, unfamiliar extract from the opening of the first movement of a Classical-era piano sonata, marked Allegro, in 3/4 time and the key of C major. The right-hand melody begins (bars 1–4) with a rising broken-chord (arpeggio) figure outlining a C major triad, C–E–G–C, played staccato, followed by a stepwise descending scale passage back down to the tonic. This opening idea is then repeated in bars 5–8, but with the third note now decorated by a turn ornament, and ending with a rising sequence instead of returning to the tonic.
Name the cadence formed by the chord progression in bars 11–12, where chord V7 moves to chord I.
查看答案详解

解题

Chord V7 (or V) moving to chord I is a perfect cadence (authentic cadence), regardless of the inversion in which the dominant chord appears.
Final answer: perfect cadence.

评分标准

[1] perfect cadence (accept 'authentic cadence').
题目 6 · Key, Device and Dance Style Identification
1
Section B: The score insert shows an original, unfamiliar extract from the opening of the first movement of a Classical-era piano sonata, marked Allegro, in 3/4 time and the key of C major. The right-hand melody begins (bars 1–4) with a rising broken-chord (arpeggio) figure outlining a C major triad, C–E–G–C, played staccato, followed by a stepwise descending scale passage back down to the tonic. This opening idea is then repeated in bars 5–8, but with the third note now decorated by a turn ornament, and ending with a rising sequence instead of returning to the tonic.
The right-hand melody in bars 1–4 outlines a broken chord built from notes of the tonic triad. Name this melodic/textural device.
查看答案详解

解题

A melodic figure that outlines the notes of a chord one after another, rather than sounding them together, is called an arpeggio (or broken chord).
Final answer: arpeggio (broken chord).

评分标准

[1] arpeggio / broken chord.
题目 7 · Key, Device and Dance Style Identification
2
Section B: The score insert shows an original, unfamiliar extract from the opening of the first movement of a Classical-era piano sonata, marked Allegro, in 3/4 time and the key of C major. The right-hand melody begins (bars 1–4) with a rising broken-chord (arpeggio) figure outlining a C major triad, C–E–G–C, played staccato, followed by a stepwise descending scale passage back down to the tonic. This opening idea is then repeated in bars 5–8, but with the third note now decorated by a turn ornament, and ending with a rising sequence instead of returning to the tonic.
This extract is in 3/4 time with a single strong beat at the start of each bar, giving it a graceful, lilting quality often associated with a courtly dance of the Classical era. Name this dance style, and state ONE other typical feature of this dance style (other than its triple metre).
查看答案详解

解题

The graceful, moderately paced triple-metre dance character described is typical of a minuet [1]. Other typical features of a minuet include its moderate tempo and elegant, graceful character, and the fact that a minuet is often paired with a contrasting Trio section, together forming a minuet and trio structure [1].
Final answer: minuet; also typically has a moderate tempo/elegant character and is often paired with a contrasting Trio section (minuet and trio form).

评分标准

[2] 1 mark: minuet (menuet) correctly named; 1 mark: any other valid typical feature, e.g. moderate tempo, elegant/graceful character, paired with a Trio in minuet-and-trio form, regular phrase structure.

部分 C: Area of Study: Sacred Vocal Music (Anthems)

Answer one question (either 3(a) or 3(b)). Extended prose response assessing musical elements and quality of written communication.
1 题目 · 15
题目 1 · Extended Analytical Essay (Choice of 1 from 2)
15
Answer ONE of the following questions, (a) or (b). In this question you will be assessed on your quality of written communication, structure and presentation of ideas.
(a) With reference to Handel's Zadok the Priest, identify and describe the composer's use of: harmony and tonality; and instrumental scoring and texture. [15]
(b) With reference to Mendelssohn's Hear My Prayer, identify and describe the composer's use of: melody and word-setting; and vocal scoring and texture. [15]
查看答案详解

解题

(a) Harmony and tonality: Zadok the Priest is written in D major, a bright, festive key well suited to the natural trumpets of Handel's Baroque orchestra, maximising the brilliance of the ceremonial sound. The famous 22-bar orchestral introduction is built on a slow harmonic rhythm, largely alternating tonic and dominant harmony through rising arpeggiated figures, creating mounting tension and anticipation rather than presenting a memorable independent melody; this tension is dramatically released with the fortissimo entry of the choir on the tonic chord at the words 'Zadok the Priest'. The choral writing that follows is built mostly on diatonic, functional harmony (tonic, dominant and subdominant), giving clarity and grandeur appropriate to a coronation anthem, with occasional suspensions adding expressive weight at cadence points.
Instrumental scoring and texture: the work is scored for a large Baroque orchestra including strings, oboes, bassoons, trumpets and timpani, typical of ceremonial/festive works of the period. The introduction is scored for strings alone, using rising arpeggiated figures passed between the parts to build texture and tension gradually, before the full orchestra and choir enter together in a sudden, dramatic tutti. The choir sings in multiple parts in a predominantly homophonic (chordal) texture, giving maximum clarity to the text and a sense of grandeur, contrasted with occasional brief imitative entries; trumpets and timpani add a bright, ceremonial fanfare quality, especially at climactic cadence points.
Final answer (a): Handel builds tension in D major through a slow-moving tonic–dominant harmonic introduction before resolving dramatically to the tonic at the choir's entry, using largely diatonic, homophonic choral harmony; the work is scored for a ceremonial Baroque orchestra (strings, oboes, bassoons, trumpets, timpani), moving from a strings-only introduction that builds texture gradually to a grand, predominantly homophonic full tutti, giving the work its celebrated ceremonial grandeur.

评分标准

Level of response marking (15 marks). Level 1 (Basic, 1–5 marks): limited, fragmented comments on harmony/tonality and/or scoring/texture, with little specialist terminology or specific reference to the chosen work. Level 2 (Good, 6–10 marks): competent selection of technical points covering both required domains, with organised structure and some accurate specialist terminology and reference to the work. Level 3 (Excellent, 11–15 marks): comprehensive, well-organised coverage of both domains, with precise, accurate reference to the chosen work and confident, accurate use of specialist musical terminology throughout.
Indicative content for (a) Zadok the Priest: harmony/tonality — D major (suited to Baroque trumpets); slow harmonic rhythm / tonic-dominant pedal in the introduction; dramatic resolution to the tonic at the choral entry; diatonic, largely homophonic choral harmony; suspensions at cadences. Instrumental scoring/texture — Baroque orchestra (strings, oboes, bassoons, trumpets, timpani); strings-only opening building texture via arpeggios; sudden full tutti entry; homophonic multi-part choral texture with brief imitation; ceremonial fanfare role of trumpets/timpani.
Indicative content for (b) Hear My Prayer: melody/word-setting — lyrical, often stepwise or arching Romantic vocal lines (including the famous soprano solo 'O for the Wings of a Dove'); largely syllabic word-setting with some expressive melisma on key words; text-expressive phrasing. Vocal scoring/texture — originally for soprano soloist, SATB choir and organ/orchestra; contrast between intimate solo passages and fuller choral tutti; predominantly homophonic choral writing with some imitative/contrapuntal moments for variety. All other valid, work-specific responses will be credited according to the level descriptors.

部分 D: Area of Study: Secular Vocal Music (Musicals)

Answer one question (either 4(a) or 4(b)). Extended prose response assessing musical elements and quality of written communication.
1 题目 · 15
题目 1 · Extended Analytical Essay (Choice of 1 from 2)
15
Answer ONE of the following questions, (a) or (b). In this question you will be assessed on your quality of written communication, structure and presentation of ideas.
(a) With reference to Bernstein's Tonight (Quintet) from West Side Story, identify and describe the composer's use of: melody and rhythm; and texture. [15]
(b) With reference to Kern's Ol' Man River from Showboat, identify and describe the composer's use of: melody and word-setting; and structure. [15]
查看答案详解

解题

(a) Melody and rhythm: in the Quintet, each character or group is given their own distinct, independent melodic line that reflects their individual perspective and mood about the coming night — Tony and Maria's lines are lyrical and soaring, reflecting their romantic anticipation, while the Jets' and the Sharks' lines are more clipped, rhythmically driven and syncopated, reflecting the tension and aggression ahead of the rumble. Bernstein's jazz-influenced compositional style is evident throughout in the syncopated rhythms and irregular accents used across the different vocal lines.
Texture: the number is built on a dense, polyphonic (contrapuntal) texture, with the separate melodic lines and lyrics for each character or group combined and overlapping simultaneously, so the audience hears several independent musical and dramatic ideas at once. This layered texture musically represents the dramatic situation of the different groups of characters converging, with conflicting motivations, on the same night; the texture increases in density and dynamic level as more voices are added and combined, building toward the climax of the number.
Final answer (a): Bernstein gives each character/group a distinct, contrasting melodic and rhythmic identity (lyrical/soaring for the lovers, syncopated/clipped for the rival gangs), combined in a dense polyphonic texture that layers these independent lines together and builds in density toward a dramatic climax.

评分标准

Level of response marking (15 marks). Level 1 (Basic, 1–5 marks): limited, fragmented comments on melody/rhythm and/or texture, with little specialist terminology or specific reference to the chosen number. Level 2 (Good, 6–10 marks): competent selection of technical points covering both required domains, with organised structure and some accurate specialist terminology and reference to the work. Level 3 (Excellent, 11–15 marks): comprehensive, well-organised coverage of both domains, with precise, accurate reference to the chosen number and confident, accurate use of specialist musical terminology throughout.
Indicative content for (a) Tonight (Quintet): melody/rhythm — distinct melodic line per character/group; lyrical/soaring lines for Tony and Maria; clipped, syncopated lines for the Jets/Sharks; jazz-influenced syncopation and irregular accents. Texture — dense polyphonic/contrapuntal combination of independent simultaneous lines; overlapping text and melody representing converging dramatic perspectives; texture and dynamic build toward the climax.
Indicative content for (b) Ol' Man River: melody/word-setting — broad, dignified, largely stepwise/scalic melody with a wide range building to a climax on the recurring title phrase; mostly syllabic, direct word-setting suited to the weighty subject matter. Structure — verse/refrain (strophic) structure, with the title phrase recurring as a refrain; contrast between quieter verse material and the more powerful, sustained refrain. All other valid, work-specific responses will be credited according to the level descriptors.

想知道自己有几分把握?

thinka 是 DSE 学生在用的 AI 练习应用,提供无限量练习题、即时自动批改和详细解题步骤。超过 100,000 名学生用它确认自己是真的会,而不只是「以为会」。

想练更多同类题型?在 thinka 无限量刷题,即时知道答案。

免费开始练习