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问题 选择题

现用18O作为示踪原子进行如下反应：2SO2（g）+18O2（g） 2 SO3（g），则当反应达到平衡后

18O原子存在于哪种物质中 [ ]

A．O2

B．SO3 、O2

C．SO3

D．SO2 、O2 、SO3

答案

答案：D

补全对话，情景问答

根据下面的对话情景，在每个空白处填上一个适当的句子，使对话的意义连贯、完整。

W: Mr. White    B: Mr. Black

W: Good morning! 1                                           ?

B: Good morning! Yes, please. I believe that this house is for sale.

W: That's right.

B: 2                                         ?

W: Yes. Of course. Come in please.

B: 3                                         ?

W: For ten years. I have been here since 2001.

B: 4                                         ?

W: 8600 pounds.

B: That's a lot of money!

W: It's worth every penny of it.

B: 5                                         . But I can't decide yet. My wife must have a look at it first.

W: Women always have the last words.

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判断题

森林病虫害的传播与现代交通工具的发展无关。
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