2018年职称英语综合类考试C级完形填空练习题（3） 职称英语C级

2018年职称英语综合类考试C级完形填空练习题（3） 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_（51） plants when to form flowers and when the flowers should open.It tells insects when to _（52） the protective cocoon （防护卵袋） and fly away,and it tells animals and human beings when to eat,sleep and wake. Events outside the plant and animal_（53） the actions of some biological clocks .Scientists recently found,for example,that a tiny animal changes the color of its fur because of the _（54） of hours of daylight.In the short_（55） of winter,its fur bees white.The fur bees gray brown in _（56） in the longer hours of daylight in summer. Inner signals control other _（57） clocks.German scientists found that some kind of internal clock seems to order birds to begin their long migration_（58） twice each year.Birds _（59） from flying bee restless when it is time for the trip,_（60） they bee calm again when the time of the flight has ended. Scientists say they are beginning to learn which _（61） of the brain contain biological clocks.An American researcher,Martin Moorhead,said a small group of cells near the front of the brain_（62） to control the timing of some of our actions.These _（63） tell a person when to wake,when to _（64） and when to seek food.Scientists say there probably are other biological clock cells that _（65） other body activities. 51 A says B asks C talks D tells 52 A reach B leave C escape D enter 53 A affect B adopt C avoid D express 54 A time B value C amount D number 55 A days B months C minutes D weeks 56 A shape B type C form D color 57 A physical B biological C mental D portable 58 A operation B flight C movement D transportation 59 A derived B prevented C originated D protected 60 A but B unless C therefore D if 61 A parts B ideas C sorts D images 62 A tries B likes C seems D wants 63 A functions B places C actions D cells 64 A lie B sleep C stand D walk 65 A build B demand C