The best title for this passage is ______. [br] The supply of groundwater is get

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问题 The best title for this passage is ______. [br] The supply of groundwater is getting low because of ______.

选项 A、conservation
B、toxic waste
C、pollution
D、population increase

答案 D

解析从文章第二段第七、八两句可知。地下水是许多城市用水的主要来源，但由于人口的增加及需水量的增加，使得一些地区的地下水位非常低。故应选D。

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