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问题 选择题

梁代诗人王籍的诗句“蝉噪林愈静，鸟鸣山更幽”是脍炙人口的名句．我们能分辨是蝉鸣声和鸟鸣声，是根据声音的（　　）

A．音调

B．响度

C．音色

D．频率

答案

通过音色能辨别物体．不同发生体的材料和结构不同，产生的音色会不同，我们是靠音色来辨别不同的发声体；因为禅和鸟的发声体不同，所以我们可以通过音色的不同来区分是蝉鸣声还是鸟鸣声．

故选C．

单项选择题

Originally, the World-Wide Web was designed as information medium for (71) research teams. A deliberately simple implementation model was chosen to make it as simple as possible for authors to (72) documents to the web, and to (73) these in the sense of updating content. This implementation model is centered around the notion of resources, usually file-base D. For the (74) intended use of the web, resources presented a useful abstraction, as they related to relatively self-contained chunks of information such as research publications and (75) pages. Such chunks of information typically could be set up and maintained independently of other resources, so that resources were the appropriate abstraction for composition and modification.

（75）（）

A.some

B.home

C.company

D.study
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单项选择题

下列各项中，不应计入营业成本的是（）。

A．商品销售成本

B．原材料销售成本

C．出租包装物成本

D．计提应收账款坏账准备
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