【名词&注释】
水资源(water resources)、水源地(water source)、综合利用(comprehensive utilization)
[单选题]在水资源的社会循环个环节中，下列做法不够恰当的是
A. 取水——保护水源地
输水——减少过程损耗
用水——节约、综合利用
排水——防止当地污染
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举一反三：
[单选题]
A. With
B. Before
C.
D. During
E. After
[单选题]The passage suggests that ________
A. all the native Indians built trunk walls all around their houses
B. all the native Indian houses were built with poles tied together
C. the Iroquois Indians took safety into account while building their wigwams
D. the Choctaw Indians in Mississippi built their wigwams with straight sides and ends
[单选题]请认真阅读下面各题，从题中所给的A、 B、 C 、D 、四个选项中，选出最佳选项，21. The population of Jiangsu __ to more than twice what it was in 1949. The figure is now approaching 74 million.
A. has grown
B. have grown
C. grew
D. are growing
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