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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大学英语三级B级

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