【題目】Something must be done to stop air pollution, we will have no fresh air.
A.or
B.for
C.but
D.so

【答案】A
【解析】句意:必須采取措施來阻止空氣污染,否則我們就沒有新鮮空氣了。A) or“否則,或者”; B) for“為了,對于”; C) but“但是”; D) so“因此”,所以。結合句意和語境可知選A。

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