题目

Which of these books do you think_______best among the best-sellers? A . sells B . is sold C . are written D . writes 答案:A金星的大气中有一种称为硫化羰(COS)的分子,其结构与CO2类似,有关COS化学用语正确的是(  )A.B.C.D.O=C=S
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