For a century and a half the piano has been one of the most popular solo ins

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问题    For a century and a half the piano has been one of the most popular solo instruments for Western music. Unlike string and wind instruments, the piano is completely【C1】________ , as it is able to play both the melody and its accompanying harmony at the same time. For this reason, it became the favorite household【C2】________ of the nineteenth century.
The【C3】________ of the piano can be traced to the early keyboard instruments of the fifteenth and sixteenth centuries — the spinet, the dulcimer, and the virginal. In the seventeenth century the organ, the clavichord (古钢琴) , and the harpsichord (拨弦钢琴)  became the【C4】________ instruments of the keyboard group, a domination they maintained until the piano replaced them at the end of the eighteenth century. The clavichord’s tone was metallic and never powerful;【C5】________ , because of the variety of tone possible to it, many composers found the clavichord a sympathetic instrument for concert use, but the character of the tone could not be 6 save by mechanical or structural devices.
The piano was【C7】________ in the early eighteenth century by a harpsichord maker in Italy (though musicologists point out several previous instances of the instrument). This instrument was called a piano e forte (soft and loud), to indicate its dynamic flexibility; its strings were【C8】________ by a recoiling hammer with a felt-padded head. The wires were much heavier in the earlier instruments. A【C9】________ of mechanical improvements continuing well into the nineteenth century, including the introduction of pedals to sustain tone or to soften it, the perfection of a metal frame and steel wire of the finest quality, finally produced an instrument【C10】________ of many tonal effects from the most delicate harmonies to an almost orchestral fullness of sound, from a liquid, singing tone to a sharp, percussive (打击乐器的) brilliance.
A. autobiography    B. struck       C. perfected          D. abandoned
E. ancestry          F. reliable       G. self-sufficient    H. nevertheless
I. therefore       J. instrument    K. varied             L. series
M. capable          N. piece          O. chief [br] 【C7】

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答案 C

解析上下文题。根据词性，此处应当填入动词过去分词。此句是该段的主题句，其大意可由段内下文推断。而根据后面的讲述，能发现有揭示题旨的词汇线索mechanical improvements“机械上的改进”和perfection“完美化”，故选perfected。

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