单项选择题

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

A) It can kill people. C) It can make it difficult to breathe.
B) It can damage plants. D) It can damage steel and concrete.
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单项选择题
A．The United States is faced with many social problems.B．Various factors are responsible for the crimes in the United States.C．New trends have been discovered in the crimes in the United States.D．The crime rate in the United State is on the rise.
A．The United States is faced with many social problems.
B．Various factors are responsible for the crimes in the United States.
C．New trends have been discovered in the crimes in the United States.
D．The crime rate in the United State is on the rise.
单项选择题
A．That drugs should not be used without doctors’ advice.B．That drugs and substances are different.C．That substances should be used in a scientific way.D．That the misuse of substances is harmful.
A．That drugs should not be used without doctors’ advice.
B．That drugs and substances are different.
C．That substances should be used in a scientific way.
D．That the misuse of substances is harmful.
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