问答题

Man should not exploit the natural resources______(以牺牲其他物种为代价)．

【参考答案】

at the cost of sacrificing/loss of other species
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问答题
Cars are responsible for most of the smog in cities，______(这已经对环境造成了严重的污染)．
单项选择题
In a fixed system，the government must______if there is a sudden demand for one currency to keep the system stable．
A．sell enough of that currency into the market
B．buy up that currency in the market
C．discourage investment
D．hold large reserves of that currency
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