Of all the things we eat and drink,water is the  1  important. Not many people understand this, but it is quite  2  . The human body can go without food for a long time, but two or three days without  3  usually makes people  4  .

   Many people do not understand how  5  water the human body needs to work well, so they do not drink  6  water. Especially in hot weather. Most people drink water only when they  7  to drink. But in fact they often need more water. Especially  8  they have had sports. About 65 to 75 percent of man’s body is water.  9  we do not have enough water, we feel tired and may   10    ill.

  (  )1. A. very       B. more       C. most         D. even

  (  )2. A. fact       B. real       C. true         D. easy

  (  )3. A. rice       B. water       C. meat         D. air

  (  )4. A. come      B. happy       C. live         D. die

  (  )5. A. many      B. long        C. much        D. often

  (  )6. A. any        B. many       C. hot         D. enough

  (  )7. A. want       B. like        C. give         D. come

  (  )8. A. when      B. but         C. since         D. where

  (  )9. A. Before     B. If         C. But          D. Why

  (  )10. A. have      B. see         C. become       D. forget

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