2. 外语
  3. Clouds are formed from ______. The supply of ground water is getting low because of ______.

Clouds are formed from ______. The supply of ground water is getting low because of ______.

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问题 Clouds are formed from ______.
The supply of ground water is getting low because of ______.
选项 A、conservation
B、poisonous water
C、pollution
D、population increase
答案D
解析 原因题。本题要求回答“地下水的补给变小了，是因为。根据第二段第八句：“But a，the population increases and the need for water also increases，the ground water in some areas is getting dangerously low. ”可知，地下水的补给量变小是由于人口的增长所致，故选D。
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