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
The policeman questioned the man because（）

A．he had seen him doing a strange thing
B．he thought he recognised him
C．the man had fallen and needed attention
D．the man had tried to escape
单项选择题
Why was James walking along that path
A．He usually discovered something suspicious along that way.
B．He had an appointment with a man at Number 25, Dugby Road.
C．He chose to go that way by chance.
D．He knew he would get home quicker that way.
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