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  3. The invention of irrigation is meaningful because it could help to According to Dr. Weiss, the second cool and dry period event

The invention of irrigation is meaningful because it could help to According to Dr. Weiss, the second cool and dry period event

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问题 The invention of irrigation is meaningful because it could help to
According to Dr. Weiss, the second cool and dry period eventually
选项 A、changed the growing season.
B、spurred the use of canals.
C、forced the farmers to desert agriculture.
D、led to declining populations.
答案B
解析 本题问根据Dr．Weiss所说，第二干冷期所产生的影响是什么。第三段中"…Dr. Weiss observes that the development of irrigation coincides with a second cool，dry period…Farmers would thus have been forced out of the area in search of other opportunities". Dr. Weiss认为干冷期将会迫使农民背井离乡寻求别的生计。第四段中紧接上段"Once again，an innovative spark was required…some of these displaced farmers that the slow-moving waters…could be diverted using canals…"表明农民在走投无路的时候想到了使用沟渠引水灌溉的办法，于是发明了灌溉。所以"促进了沟渠的利用"正确。改变了生长季节：第三段中"His analysis…suggests that rainfall…would…have fallen below the level needed to sustain farming reliably"表明干冷期的降水量无法保证耕种正常进行。但这并不表明生长季节发生了变化。迫使农民放弃了农业：文中提到"Farmers would thus have been forced out of the area in search of other opportunities"。接着又提到农民在走投无路的时候想到了利用沟渠引水灌溉的办法。也就是说，由于发明了灌溉，农民们并没有放弃农业。导致人口减少：第三段中"Farmers would thus have been forced out of the area"及第四段中"some of these displaced fanners"都表明农民是被迫迁移，而没有谈到人口数量减少。当然，由于气候对农业的影响，人口很可能减少，但是在本文中没有谈到这点，因此不能选本项。本项只是出题者根据常识而设置的干扰项。
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