For decades the market for expensive headphones was mainly limited to hi-fi fans. But【C1】________the boxy stereo system in the c

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问题     For decades the market for expensive headphones was mainly limited to hi-fi fans. But【C1】________the boxy stereo system in the corner of the bedroom is largely a thing of the past, and young music fans listen【C2】________on portable devices, headphones have become as much of a fashion statement as the music player itself.【C3】________the first to spot the potential of this market was Dr Dre and Jimmy Iovine. In 2008 they【C4】________their Beats range of headphones, to great【C5】________. They have all but created a new product【C6】________: premium-priced headphones whose sound quality is good enough,【C7】________which mainly sell on their brand image.
    Beats Electronics and its founders have proved skilled【C8】________using celebrity endorsements and product placement to【C9】________his headphones. In America the company now has almost half the market for premium-priced headphones, compared with 21% for Bose, a longer-established maker. Beats headphones are exactly what hip-hop fans want, but might not suit opera lovers. Overall,【C10】________, they are a lot better than the earphones that come free with most portable devices.
    There is in any case a limit to how good music will sound through even the best headphones. Most of the music tracks on portable music players are in the form of mp3 audio files, in which the music has been【C11】________to make the files smaller and【C12】________fit more of them into a【C13】________amount of storage capacity.
    Since consumers have been persuaded, largely by Beats, that it is worth paying a high price for headphones, perhaps they could be persuaded to turn their backs on cheap mp3s and【C14】________recordings in true high fidelity.
    If sales of hi-fi recordings take off it may【C15】________the market for really top-class headphones like those of Grado Labs, another American firm. Grado has for decades relied on reviews in specialist magazines, and word-of-mouth【C16】________from fans, to spread news of its headphones’【C17】________reproduction. In contrast to Beats, it has avoided image making it has not【C18】________since 1964 Unlike Dr Dre, then, its【C19】________are less tied to the【C20】________tastes and fast-changing fashions of the young.
【C6】

选项 A、category
B、contract
C、service
D、partnership

答案A

解析 所需名词是句子宾语的中心词,修饰它的不定冠词a表明它是单数名词,但冒号后用于解释它的headphones一词又是复数形式。由此应推断所需名词在语法形式上虽是单数但在语义上需要概括不同的耳机。A项category“类别”符合要求。B项contract“合同”、C项service“服务”和D项partnership“伙伴关系,合作关系”都不能对应冒号后的headphones一词,无法概括headphones的特征。
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