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问题 单项选择题

（）as the chemical extinguisher agent, should be used for a an electric fire.

A.Dry chemical or foam

B.Foam or soda acid

C.carbon dioxide or foam

D.carbon dioxide or dry chemical

答案

参考答案：D

补全对话，情景问答
根据对话内容。从方框内的选项中选出能填入空白处的最佳选项。
A: Do you like animals?
B:   1  
A: Let's go to see animals this afternoon. There is a new zoo in our city.
B:   2  
A:   3  
B: Dolphins!
A:   4              
B: Because they are kind of smart. I like to watch a dolphin show.                        
A: Well, I like elephants.
B: Why do you like them?
A:   5 They can do lots of things with their noses(鼻子).
A. Because they're interesting.
B. What animals do you like?
C. Why do you like them?
D. That's a good idea!
E. Yes, I do.
F. Why are they interesting?                                                  
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多项选择题

由于（），造成旅客未能在客票有效期内完成旅行，承运人应当按规定延长旅客的客票有效期。

A、承运人因运力调配取消了旅客所乘坐的航班

B、航班因备降没有到达经停站，而该经停点是旅客的出发点

C、承运人不能提供旅客已定的头等舱座位

D、旅客未预先确认座位
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