与普通标号汽油相比,高标号汽油的优点有()。
A.改善汽车动力性能
B.降低用户维修费用
C.减少油耗
D.保护环境
参考答案:A, B, C, D
Since then the number of people who were addicted to smoking ________ 20%.[ ]
A.has reduced to
B.reduces by
C.has reduced by
D.have reduced by
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