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问题 选择题

在2010年的春节联欢晚会上,小虎队20年后重新聚首，演唱了他们的经典歌曲。在演唱时，观众能分辨出三人的声音主要是根据他们歌声的什么不同？

A．音调

B．响度

C．音色

D．声速

答案

答案：C

音调大小反映的是声音的高低，它跟发声体振动的频率有关；

响度反映的是声音的大小，它跟发声体的振幅有关；

音色反映的是声音的品质与特色，它跟发声体的材料和结构有关；

小虎队演唱同一首歌曲，他们的音调和响度可能相同，但音色绝对不同，所以选项A、B、D不正确，C现象正确；

故选C．

填空题

呼叫记录和呼叫之间存在着（）关系。
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单项选择题

American Museum of Natural History is one of the largest natural and historic museums in the world and one of the main natural history research and education centres in the United States, set up in 1869 and located in the west of the Central Park, Manhattan District, New York. It (1) 7 hectares in its total area, (2) classical types of buildings. The (3) of ancient creatures and humanity is (4) the first place of all the museums in the world, (5) the representative samples from South America, Africa, Europe, Asia and Australia were collected, besides those from the (6) country, the United States.In the museum, there are five kinds of exhibits, including astronomy, mineralogy, human history, and animals in the (7) times and those in modern times. There are thirty-eight exhibition halls with different (8) from 500 to 1,500 square metres. Besides these, there is a Roosevelt Memorial Hall in (9) of President Roosevelt who supported the (10) of the museum, which is also used to have a special exhibition, showing the new important (11) on natural sciences and (12) affairs and social problems, and special topics connected closely with the life of the citizens. Besides this, it is also used for avocation (13) to have all kinds of scientific activities in the laboratories, centres of natural science and centres for citizens. There are more than 10 (14) research departments mainly(15) for collection of samples, research and work of publication.In the museum, there are (16) and sub-libraries of Aulspond ancient amniote, with about 300 thousand books and magazines (17) natural history, many of(18) are very valuable monographs for the first edition. It has published many expert books and magazines, and a large number of propaganda materials, (19) which are the two magazines, Natural History and Members of Museum that have the biggest (20) of their magazines.

12（）

A.present

B.crucial

C.current

D.prevalent
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