单项选择题


Questions 23 to 25 are bused on the conversation you have just heard.

A．It can kill people.
B．It can make it difficult to breathe.
C．It can damage plants.
D．It can damage steel and concrete.
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单项选择题
A．People will become seriously ill.B．People will become dependent on them.C．They will make people feel tired.D．They will give people headaches.
A．People will become seriously ill.
B．People will become dependent on them.
C．They will make people feel tired.
D．They will give people headaches.
单项选择题
A．Bob will see Susan tomorrow evening.B．Bob asked the woman to come another time.C．Bob and Susan have decided to go on a holiday.D．Bob might be at home late tomorrow evening.
A．Bob will see Susan tomorrow evening.
B．Bob asked the woman to come another time.
C．Bob and Susan have decided to go on a holiday.
D．Bob might be at home late tomorrow evening.
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