問題詳情

Ⅲ. 綜合測驗：
      Rainforests are the Earth’s oldest living ecosystems. They  22  only a small part ofthe Earth’s surface, about six percent, but they are very important to us. For example, theyprovide us with   23   of the Earth’s oxygen and fresh water. A lot of medicines we use todayto treat cancer or heart disease   24   from the plants that grow only in rainforests. Many itemswe use in our own homes come from the rainforest as well.   25   , rainforests are disappearingat an alarmingly fast pace, largely due to human development over the past few centuries.Problems   26   from the decrease of rainforests include more pollutions, less oxygen, andfewer species of animals. To keep rainforests from disappearing and save the Earth for ourchildren, we must do something immediately.
22.
(A) call off
(B) look into
(C) make up
(D) turn down

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