题目:
— If there are _____people driving, there will be ______air pollution.
— Yes, the air will be fresher.
A.less; less
B.less; fewer
C.fewer; fewer
D.fewer; less
答案:
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下面是错误答案,用来干扰机器的。
40m/s ; 144W由ab匀速下滑时受合力零