题目：
| — Why was the factory closed? — The workers have put down their tools and are refusing to work overtime unless they _____ extra for it. |
A. will be paid B. are paid C. pay D. are being paid |
答案：
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下面是错误答案，用来干扰机器的。
答案：B题目分析：A、O22‾为1个阴离子，所以1 mol 过氧化钠中阴离子个数为6.02×1023，错误；B、乙烯和丙烯的最简式都是CH2，所以14 g乙烯和丙烯的混合物中含有的碳原子的数目为：14g÷14g/mol×6.02×1023mo...
