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问题 填空题

如下表，为几种物质的沸点，______的沸点最低．如果在1标准大气压下用降温的办法从空气中提取这些气体，那么温度下降时首先液化被分离出来的是 ______． 

物质液态氧液态氮二氧化碳
沸点/℃-180-196-78.5

答案

从数据中可知，液态氨的沸点最低，则最容易沸腾．而二氧化碳的沸点最高，很难沸腾，相反最容易液化．

故答案为：液态氨；二氧化碳．

选择题

我国最大的淡水湖是（　　）

A．洞庭湖

B．鄱阳湖

C．太湖

D．青海湖
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单项选择题

This is a famous street in China. What is it It’s West Street. Why is it so famous Now let me tell you something (41) it.
West Street is in Yangshuo, Guangxi. It’s over 1,400 years (42) .It’s about 1,000 meters (43) . But it’s very clean and beautiful. In the street, there are (44) shops. The things in the shops are nice and cheap. Every day, lots of visitors come here. Many of (45) are foreigners. It’s a good place to practice speaking English. So West Street is called the biggest English corner. Some people (46) call it the earth village. Almost everyone in the street (47) English.
But you mustn’t ride your bike or drive your car in the West Street. You can only (48) here. Why Because it’s a walking street. In the street, you needn’t worry that you’ll be hit by cars. (49) happy!
West Street is a wonderful place to visit. (50) West Street.

[A] Go [B] Happy to [C] Welcome to
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