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问题 选择题

I don't know          they can pass the exam or not.[ ]

A. what

B. that    

C. how

D. whether

答案

答案：D

问答题

Quality of Life Is Much More Than a Job


Remember to indicate your position clearly, support yourself with sound, reasons and sufficient evidence, and bring it to a natural solution. A logical organization benefits your essay in every possible way. Your essay should contain about 400 words.
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单项选择题

在二氧化碳回手减压过程中，一部分残留的二氧化碳（）。

A.气化

B.液化

C.固化

D.升华
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