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问题 多项选择题

连续油管注入液氮气举排液具有特点（）。

A.减少对油层损害

B.排液速度快

C.掏空深度大

D.逐步降低井底回压

E.使用安全

答案

参考答案：A, B, C, D, E

补全对话，情景问答
补全对话，有两个选项多余。


A: I am going to be a writer.
B: I am going to New York to take my lessons.
C: I am going to take writing lessons/
D: No, I am not. I am going to sing rock songs.
E: When are you going to start?
F: I want to be a singer.
G: How are you going to become a singer?

A: What are you going to be when you leave school?
B: __1__
A: Are you going to sing pop songs?
B: __2__ 
A: __3__ 
B: I am going to take singing lessons.
A: __4__ 
B: I am going to start next month.
A: Where are you going to take singing lessons?
B: __5__ 
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简答题

我国十分严重的环境问题的主要表现。

                                                                                                                                                               

                                                                                                                                                              

                                                                                                                                                                
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