单项选择题


Questions 29 to 31 are based on the passage you have just heard.

A．They can be used to do business with people.
B．They can be used to express all kinds of feelings.
C．They can be used to deliver all the messages in our life.
D．They can be used to convey our most important messages to people.
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填空题
This passage explains the basic idea of natural gas and compares the performances of different types of NGVs.
单项选择题
A．Where they should move.B．How to negotiate with the landlord.C．How to fight the increase.D．Whether to accept an increase in rent or move.
A．Where they should move.
B．How to negotiate with the landlord.
C．How to fight the increase.
D．Whether to accept an increase in rent or move.
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