2. 外语
  3. The first paragraph mainly talks about ______. A dam is usually built ______.

The first paragraph mainly talks about ______. A dam is usually built ______.

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问题 The first paragraph mainly talks about ______.
A dam is usually built ______.
选项 A、to cover the houses and fields
B、for people to have the right amount of water at all times
C、to help crops grow better
D、to form a large lake
答案B
解析 从第二段开头可知，为了解决上述问题，可以在河流上修建水坝，使之能旱季储水，雨季蓄洪。也就是说，使人们总是能有适量的水。[C]为干扰项，修建水坝并不止对农作物起有利的作用。
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