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问题 填空题

Спектакль закончился, _______ публика вышла из зала.

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参考答案： и

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Mr. Green：Hello! This is English－help Centre.   1 
Li Lei：Yes. I have some problems with English.
Mr. Green：  2 
Li Lei：First, I can’t speak English well.
Mr. Green：  3  Why not join a language club to practice English?
Li Lei：OK, I’ll try it. Also I can’t understand the teacher when she talks to the class.
Mr. Green：Listening to more tapes will help a lot. Remembering the words of English songs also helps a lot.
Li Lei： 4  I’ll do that as much as possible.
Mr. Green：You’re welcome.   5 
A. Don’t worry.
B. I hope your English will improve soon.
C. Can I help you?
D. Thank you very much.
E. What are your problems?
1.____________  2.____________  3.____________  4.____________  5.____________ 
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填空题

镁是一种用途很广的金属材料，目前世界上60%的镁从海水中提取．主要步骤如下：

（1）为了使MgCl2转化为Mg（OH）2，试剂①可以选用_________，要使MgCl2完全转化为沉淀，加入试剂①的量应_________，验证MgCl2已完全转化为Mg（OH）2的方法是_________．

（2）加入试剂①后，能够分离得到Mg（OH）2沉淀的方法是_________．

（3）试剂②可以选用_________．

（4）无水MgCl2在熔融状态下，通电后会产生Mg和Cl2，写出该反应的化学方程式_________．
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