完型填空: 从每小题ABC三个选项中选出能填入空白处的最佳答案。
Of all the things we eat and drink, water is  ________ important. Not many people realize this, but it’s quite true. The human body can go ________  food for a long time, but two or three days without  ________  usually leads to death . Many people do not understand how much water the human body needs and many people do not   ________ enough. Most people drink enough only in hot weather. Most people drink when they are ________ , but we often need ________ water, especially when we have been doing exercise.
A man’s body is 65~75% water. Water is very important in several different ________. Most people need ________5~7 liters of water every day, but we don’t need to drink that much, because a lot of water  ________ from the food we eat. If we do not have enough water, however, we feel ________ and may become ill. Now, do you know what the best drink is?
A. much        B. more         C. the most
A. with        B. without      C. to
A. food         B. air          C. water
A. drink       B.eat            C. have
A. hungry       B. thirsty       C. need
A. less        B. a lot        C. more
A. times       B. ways         C. days
A. for         B. about        C. with
A. come         B. came         C. comes
A. hungry      B. happy         C.tired