单选题The author says that in some hot and dry areas it is advisable to _____.A build big lakes to store waterB construct big pumping stationsC channel water from nearby rivers to croplandD build small and cheap irrigation systems

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单选题

The author says that in some hot and dry areas it is advisable to _____.

build big lakes to store water

construct big pumping stations

channel water from nearby rivers to cropland

build small and cheap irrigation systems

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大学英语六级

单选题The author says that in some hot and dry areas it is advisable to _____.A build big lakes to store waterB construct big pumping stationsC channel water from nearby rivers to croplandD build small and cheap irrigation systems

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