The best title for this passage is ______. The amount of groundwater is ______.

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问题 The best title for this passage is ______.
The amount of groundwater is ______.

选项 A、about 95% of all groundwater
B、less than 5% of all water
C、0.05% of above groundwater
D、95% of above groundwater

答案B

解析 依据文章第二段第三、四两句:地球上95%的水是存在于海洋之中,5%的水存在于陆地上,其中0.05%的水是河流及湖泊。说明地下水不足5%。
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