完形填空。 We have known for a long time that

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完形填空。
We have known for a long time that flowers of different plants open and close at different times of day.This is so __1__ that there seems to be no need to ask the reason for it. Yet no one __2 __ understands why flowers open and close like this at particular times. The process is not as __3__ as we might think,as recent experiments have shown. In one study, flowers were kept in constant __ 4__. We might expect that the flowers, without any information about the time of day, did not open as they __ 5 _ do. As a matter of fact, they __ 6__ to open at their usual time. This suggests that they have some mysterious(神秘的) way of knowing the __ 7__. Their sense of time does not __ 8__ information from the outside world; it is, so to speak, inside them, a kind of "inner clock". This __ 9 __ may not seem to be very important. However, it was later found that not just plants but also __10__ , including man, have this "inner clock" which __ 11__ the working of their bodies and influences their activities. Men, then, are also influenced by this mysterious __ 12__. Whether we wish it or not, it affects such things in our life as our need for sleep, our need for food. In the past, this did not really __13 __ because people lived in natural condition. In the __14 __ world, things are different; now there are spacemen, airplane pilots and, in ordinary life, a lot of people who have to work at night. It would be very __ 15_ , then, to know more about the "inner clock". Such things as flowers might help us understand more about ourselves.
( )1. A. familiar ( )2. A. partly ( )3. A. complex ( )4. A. quietness ( )5. A. finally ( )6. A. refused ( )7. A. time ( )8. A. deal with ( )9. A. discovery ( )10.A. beasts ( )11.A. controls ( )12.A. world ( )13.A. happen ( )14.A. ancient ( )15.A. hard	B. strange B. personally B. simple B. darkness B. completely B. decided B. secret B. add to B. activity B. animals B. studies B. flower B. exist B. modern B. expensive	C. similar C. really C. mature C. loneliness C. physically C. continued C. process C. give away C. invention C. strangers C. measures C. power C. matter C. wonderful C. convenient	D. special D. willingly D. meaningful D. sadness D. normally D. failed D. study D. depend on D. method D. humans D. destroys D. experiment D. work D. peaceful D. important

1-5: A C B B D 6-10: C A D A B 11-15: A C C B D

英语翻译We have known for a long time that flowers of different 完形填空。 We know that trees are useful 英语阅读,Doctors have known for a long time that extremely loud 完形填空。 Known as the Animal Lady in t 完形填空。 Do you have a healthy lifesty 完形填空。 I have a friencl. His name is 听音，填空。 1. We have a beautiful __________ Have you known Jessie for a long time?Yes,since 短文填空 That is a 完形填空. 完形填空. For several years,Americans have en 阅读理解 A long time ago people t 句型转换1.We have known each other for a long time.（改为一般疑问句）____