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举一反三
【单选题】In many places water is becoming scarcer. Treating it as a right makes the scarcity worse. Ideally, efficient water use would be encouraged by charging for it, but attempts to do so have mostly proved...
A.
People should only be entitled to certain amount of water free.
B.
People can borrow water from their neighbors when necessary.
C.
People are free to bargain for water in market in their daily lives.
D.
People have the right to trade water to raise water productivity.
【单选题】从1980--1999年商品蔬菜种植面积分布的变化，可以推断出
A.
沿交通干线出现一批蔬菜种植基地
B.
农村地区蔬菜的商品率降低
C.
粮食种植面积大幅度缩小
D.
通过大规模垦荒，增加了耕地面积