单选题The author says that in some hot and dry areas it is advisable to _____.Abuild big lakes to store waterBconstruct big pumping stationsCchannel water from nearby rivers to croplandDbuild small and cheap irrigation systems
单选题
The author says that in some hot and dry areas it is advisable to _____.
A
build big lakes to store water
B
construct big pumping stations
C
channel water from nearby rivers to cropland
D
build small and cheap irrigation systems
参考解析
解析：
细节题。第四段第二句提到，在热带干旱地区可“通过一些小规模的工程，例如在凹地收集雨水，旱时用泵抽雨水来灌溉附近的农田。”这是最便宜的供水方式。
细节题。第四段第二句提到，在热带干旱地区可“通过一些小规模的工程，例如在凹地收集雨水，旱时用泵抽雨水来灌溉附近的农田。”这是最便宜的供水方式。
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Many ______ large and big business ______ been built up from small ones. A. a, hasB. /, hasC. a, haveD. a, had
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