2. 外语
  3. Every living thing has what scientists call a biological clock that controls behavior. It tells plants when to 【C1】______ flower

Every living thing has what scientists call a biological clock that controls behavior. It tells plants when to 【C1】______ flower

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问题    Every living thing has what scientists call a biological clock that controls behavior. It tells plants when to 【C1】______ flowers and insects when to leave protective cocoon(茧) and fly away. And it tells animals and human beings when to 【C2】______ , sleep and seek food. It controls our body temperatures, the  【C3】______  of some hormones and even dreams.  
   Events 【C4】______ the plant and animal affect its actions. Scientists recently found that a tiny animal called Siberian hamster changes the color of its  【C5】______  because of the number of hours of 【C6】______ . In shorter days of winter its fur becomes white. The fur becomes gray-brown in longer 【C7】______ of daylight in summer.  
     【C8】______  signals control other biological clocks. German scientists found that some internal one seems to order birds to begin their  【C9】______    flights two times each year. Birds prevented from flying become 【C10】______ when it is time for the trip.  【C11】______  they become can again when the time of the flight has ended. A mix of outside and internal events controls some biological clocks；such things as heartbeat and the daily change from sleep to walking take place because of both external and internal signals.  
   Scientists are beginning to learn 【C12】______ parts of the brain contain the biologicaI clocks. A researcher at Harvard University. Dr. Martin Moore Ede, said a small group of cells near the front of the brain seemed to control the 【C13】______ of some of our actions. Probably there are other cells to control other body activities. He is studying 【C14】______ they affect the way we do our work. Most of us have great difficulty if we 【C15】______ often change to different work hours. 【C16】______ call take many days for a human body to 【C17】______ a major change in work hours. Industrial officials should have a better 【C18】______ of biological clocks and how they affect workers. He said such an understanding could 【C19】______ sickness and accidents at work, and would help increase 【C20】______ .   
【C19】
选项 A、decrease
B、diminish
C、decline
D、reduce
答案D
解析 动词辨析题。根据本句大意，了解生物钟对工作应该有一定好处，所以在工作中突发的疾病和事故应该会有所减少，因此选择D．reduce，指人为地使某物在数量或重量方面的减少或降低。A．decrease指“数量上的减少；力量或者强度的减弱”；B．diminish指“因为不断消耗．在数量方面缓慢减少或素质、价值的下降”；C．decline“(数目、价格、比率)下降；谢绝，婉言推辞；衰退，衰落”。  
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