20gA物质和14gB物质恰好完全反应，生成8.8gC物质、3.6gD物质和0.

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问题选择题

20gA物质和14gB物质恰好完全反应，生成8.8gC物质、3.6gD物质和0.2molE物质，则E物质的摩尔质量为（　　）

A．100g/mol

B．108g/mol

C．55g/mol

D．96g/mol

答案

答案：B

问答题

根据实际情况回答问题。

1. Is your birthday in November?

__________________________________.

2. Do you clean your room in the evening?

__________________________________.

3. What's the weather like in fall?

__________________________________.

4. What's the date today?

__________________________________.

5. When do you usually go to school?

__________________________________.

6. What are you doing now?

__________________________________.

问答题

图书和期刊分别有哪些结构部件？其中什么部件是必备的，什么部件是可选择的？这些部件各承载哪些著录项目？