职称英语等级考试完型填空模拟试题及参考答案.docx
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1、 职称英语等级考试完型填空模拟试题及参考答案 阅读下面的短文。短文中有15个空白,在文章的后面,每一个空白都列出了四个备选答案。请依据文章的”内容选择适宜的词或短语填在空白处。 A Biological Clock Every living thing has what scientists call a biological clock that controls behavior. The biological clock tells _when to form flowers and when the flowers should open1. It tells _ when to le
2、ave the protective cocoon and fly away, and it tells animals and human beings when to eat, sleep and wake. Events outside the plant and anima _the actions of some biological clocks. Scientists recently found, for example, that a tiny animal changes the color of its fur_ the number of hours of daylig
3、ht . In the short _ of winter , its fur becomes white. The fur becomes gray brown in color in the longer hours of daylight in summer. Inner signals control other biological clocks. German scientists found that some kind of internal clock seems to order birds to begin their long migration _ twice eac
4、h year. Birds _ flying become restless when it is time for the trip, _ they become calm again when the time of the flight has ended. Scientists say they are beginning to learn which _ of the brain contain biological clocks. An American researcher, Martin Moorhead, said a small group of cells near th
5、e front of the brain _to control the timing of some of our actions. These _ tell a person when to _ , when to sleep and when to seek food. Scientists say there probably are other biological clock cells that control other body activities. Dr. Moorhead is studying _ our biological clocks affect the wa
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