2018年职称英语卫生类C级完形填空练习题（5）职称英语C级

1、2018年职称英语卫生类C级完形填空练习题（5）职称英语C级 A Special Clock Every living thing has what scientists call a biological clock that controls behavior.The biological clock （1） plants when to form flowers and when the flowers should open.It _s insects when to （2） the protective cocoon （防护卵袋） and fly away,and it _s ani

2、 _ls and hu _n beings when to eat,sleep and wake. Events outside the plant and ani _l （3） the actions of some biological clocks.Scientists re _ntly found,for example,that a tiny ani _l changes the color of its fur because of the （4） of hours of daylight.In the short （5） of winter,its fur bees white.

3、The fur bees gray brown in （6） in the longer hours of daylight in summer. Inner signals control other （7） clocks.Ger _n scientists found that some kind of internal clock seems to order birds to begin their long migration （8） twi _ each year.Birds （9） from flying bee restless when it is time for the

4、trip,（10） they bee calm again when the time of the flight has ended. Scientists say they are beginning to learn which （11） of the brain contain biological clocks.An American researcher,Martin Moorhead,said a s _ll group of _lls near the front of the brain （12） to control the timing of some of our ac

5、tions.These （13） _ a person when to wake,when to （14） and when to seek food.scientists say there probably are other biological clock _lls that （15） other body activities. 1 A says B asks C _s D talks 2 A leave B reach C escape D enter 3 A adopt B affect C avoid D express 4 A length B value C number

6、D amount 5 A months B days C minutes D weeks 6 A shape B type C color D form 7 A biological B physical C mental D portable 8 A flight B operation C movement D transportation 9 A prevented B derived C originated D protected 10 A unless B but C therefore D if 11 A ideas B parts C sorts D i _ges 12 A tries B likes C wants D seems 13 A functions B pla _s C _lls D actions 14 A sleep B lie C stand D walk 15 A build B de _nd