Since then the number of people who were

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问题选择题

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

答案

答案：C

选择题

N_A表示阿伏加德罗常数。下列说法正确的是

A．7.8 g Na₂O₂中含有的阴离子数目为0.2 N_A

B．标准状况下，2.24 L SO₃的分子数为0.1 N_A

C．9.2 g NO₂和N₂O₄的混合气中含有的氮原子数为0.2 N_A

D．1 L 0.1 mol/L Al₂(SO₄)₃溶液中，Al³⁺的数目为0.2 N_A

选择题

As the saying ____, "Where there is a will, there is a way." [ ]

A. go

B. goes

C. going

D. went