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．She just finished studying for the exam.B．She is not certain about what materials will be covered on the exam.C．She needs to prepare a little more for the exam.D．She is willing to help the man study for the exam.
A．She just finished studying for the exam.
B．She is not certain about what materials will be covered on the exam.
C．She needs to prepare a little more for the exam.
D．She is willing to help the man study for the exam.
单项选择题
B
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