完形填空。 1 all the things we eat and drink, water is the 2 important. Not 3 people understand this, but it is quite true. The human body can go 4 food for a long time, but two 5 three days without water usually make people 6 . Many people don't understand how 7 water the human body needs 8 well and many people don't drink enough, especially in hot weather. More people drink when they are thirsty. They often need more water, especially when they take exercise. A man's body is 65 to 75 percent water. If we don't have 9 water, we feel 10 and may become ill. Do you know what the best drink is? (     )1. A. At (     )2. A. more (     )3. A. many (     )4. A. with (     )5. A. and (     )6. A. dead (     )7. A. many (     )8. A. work (     )9. A. some (     )10. A. fine B. By B. much B. few B. on B. or B. to die B. little B. to work B. a little B. tired C. Of C. least C. lots of C. without C. but C. dying C. much C. working C. all C. happy D. In D. most D. much D. by D. of D. died D. can D. works D. enough D. well