单项选择题


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

A．People can spray confine oxide on their car engines easily.
B．The material works as a pollution filter.
C．The material saves fuel for it reflects back the heat of burning fuel.
D．When burnt, the material will save fuel.
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单项选择题
A．To develop a greater resistance.B．To increase the spread of infections.C．To create a good environment.D．To increase being infected.
A．To develop a greater resistance.
B．To increase the spread of infections.
C．To create a good environment.
D．To increase being infected.
单项选择题
A．The catalogs were helpful with the study of students.B．They used the catalogs to place orders.C．Their textbooks were not as good as the catalogs.D．The prices of things in the catalogs were low.
A．The catalogs were helpful with the study of students.
B．They used the catalogs to place orders.
C．Their textbooks were not as good as the catalogs.
D．The prices of things in the catalogs were low.
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