Rivers have been important to man ______. In heavily populated agricultural areas, ______ when crops fail.

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问题 Rivers have been important to man ______.
In heavily populated agricultural areas, ______ when crops fail.

选项 A、everybody takes to water sports
B、the people starve
C、a shortage of water will help
D、more energy will be used

答案B

解析 本题问的是在农业密集的地区,当庄稼收成不好时,将产生什么后果?从文章第三段最后一句,我们可以得出答案——巨大的灾难和饥饿。
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