单项选择题

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

A．The problems of environment pollution.
B．A material which can save fuel.
C．The installation of pollution filters.
D．The way to spray a coat on the engines.
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单项选择题
A．More than thirty six thousand dollars.B．More than fourteen thousand dollars.C．Twenty thousand dollars.D．Less than seventy-four dollars.
A．More than thirty six thousand dollars.
B．More than fourteen thousand dollars.
C．Twenty thousand dollars.
D．Less than seventy-four dollars.
单项选择题
A．It can increase the spread of infections.B．It can reduce the spread of infections.C．It is good to other children.D．It is good to the whole family.
A．It can increase the spread of infections.
B．It can reduce the spread of infections.
C．It is good to other children.
D．It is good to the whole family.
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