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【单选题】
下列各组有机物只用一种试剂无法鉴别的是（   ）
A.
乙醇、苯、四氯化碳
B.
苯、苯酚、己烯
C.
苯、甲苯、环己烷
D.
苯、乙醛、乙酸
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【简答题】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...
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