单项选择题


Questions 19 to 22 are based on the conversation you have just heard.

A．The use of steel in building construction.
B．Computer usage.
C．Database on computer.
D．Building construction.
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单项选择题
A．He stopped driving a car two years ago.B．He drove a car before but not any more.C．He doesn’t like driving.D．He hasn’t driven for two years but now he does.
A．He stopped driving a car two years ago.
B．He drove a car before but not any more.
C．He doesn’t like driving.
D．He hasn’t driven for two years but now he does.
填空题
This passage is mainly about how the development of airline industry has affected the environment through its greenhouse gases emission.
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