摘要：Of all the things we eat and drink, water 16 the most important. Not many people realize this 17 it is quite true. The human beings can 18 without food for a long time but two 19 three days without water usually results in 20 . Many people don't understand how 21 water the human being needs 22 work properly and many people do not drink 23 , especiallyin 24 weather. Most people drink 25 they are thirsty. But we often need more water, especially 26 we have been taking exercises. A man's body is 67 to 75 percent 27 water. Water is very important in several different 28. Most people need about five 29 seven liters(升)of water every day, but we do not need 30 this amount 31 a lot comes from the food 32 we eat. If we do not have 33 water we feel tired and may 34ll. Do you know what the best drink 35 ? Yes. You are right, cold water. 16. A. are B. was C. is D. would be 17. A. however B. so C. that D. but 18. A. have B. live C. die D. keep 19. A. and B. or C. but D. for 20. A. dead B. dying C. died D. death 21. A. big B. much C. many D. little 22. A. to B. for C. so D. and 23. A. some B. too much C. enough D. little 24. A. hot B. cool C. cold D. rainy 25. A. water B. a lot C. at D. when 26. A. if B. that C. because D. since 27. A. to B. of C. in D. on 28. A. manner B. results C. ways D. needs 29. A. or B. and C. to D. from 30. A. drink B. drinking C. to drink D. to be drunk 31. A. and B. because C. that D. or 32. A. × B. what C. why D. when 33. A. some B. enough C. that D. all 34. A. have B. are C. feel D. fall 35. A. was B. is C. all D. like

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