单项选择题

This passage is primarily about （） .

A．the greenhouse effect
B．the burning of fossil fuels
C．the potential effect of air pollution
D．the likelihood of a new ice age

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单项选择题

In the following, which subject is the safest one to start a conversation （）

A．Salary.
B．Privacy.
C．Politics.
D．Weather.

单项选择题

59（）

A. I’m sorry you can’t.
B. Sure, it’s my pleasure.
C. Well, take things easy.
D. I’ll be glad to.
E. Thank you.
F. Really
G. You’re always welcome.
H. I’m sorry to hear that.