The total quantity of water on Earth________.A.ha
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The total quantity of water on Earth________.
A.has greatly increased in recent years
B.remains almost unchanged
C.is decreasing constantly
D.is affected by global warming
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答案:B
第二段第一句提到地球上水的供给“remains fairly constant in quantity",数量上是恒定的,它就没有增加也不会减少,只不过会以不同的形态出现,所以选择B(保持不变)。
