45. 北京之行可能要取消。
The trip to Beijing might be .
科目：初中英语 来源： 题型：
5. 将来，越来越多的人将庆祝他们的百岁生曰。
，more and more people will celebrate their birthdays.
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科目：初中英语 来源： 题型：
Up to two thirds of children don't get as much sleep as they should do,and this can make them nervous and slower at school,researchers say.
So 16 should young people sleep each night? The answer is between 8 and 10 hours. If you don't get enough sleep at night,you'll have 17 energy the next day.
But the researchers say many children have missed out on 4,500 hours of sleep 18 the time they are 7 years old. They say that children miss sleep because they have TVs and computers in their rooms and 19 parents don't read to their younger children at night any more. The traditional "bedtime story" helps children to relax and fall asleep 20 . Children with TVs and computers in their bedrooms are more likely to sleep badly,and to get less than 8 hours' sleep. Even losing one hour's sleep a night can mean that children do less well at school.
German scientists think that your 21 keeps working while you are asleep. To show that they were 22 ,they gave two groups of people a problem to work out. One group went to sleep and the other group stayed 23 . The result? The people who slept worked out the answer more quick?ly,suggesting that their brains had been trying to 24 the answer while the people were asleep. So,make sure you get enough sleep tonight,25 you'll be at your best tomorrow.
( ) 16. A. how much B. how many
C. how long D. how often
( ) 17. A. more B. less C. few D. little
( ) 18. A. by B. at C. on D. during
( ) 19. A. proud B. free C. poor D. busy
( ) 20. A. peacefully B. carefully
C. happily D. sadly
( ) 21. A. head B. brain
C. heart D. thought
( ) 22. A. perfect B. bright
C. right D. great
( ) 23. A. awake B. alive
C. asleep D. absent
( ) 24. A. think over B. open up
C. find out D. put down
( ) 25. A. or B. but C. if D. and
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