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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】政府应该不允许烟草公司在其营业收入中扣除广告费用。这样的话，烟草公司将会缴纳更多的税金。烟草公司只好提高自己的产品价格，而产品价格的提高正好可以起到减少烟草购买的作用。 以下哪项是题干论点的前提( )。
A.
烟草公司不可能降低其他方面的成本来抵消多缴的税金
B.
如果它们需要付高额的税金，烟草公司将不再继续做广告
C.
如果烟草公司不做广告，香烟的销售量将受到很大影响
D.
烟草公司由此所增加的税金应该等于价格上涨所增加的盈利