单项选择题

Questions 22 to 25 are based on the conversation you have just heard.

A．She thinks they are impractical.
B．She thinks they are useful but too expensive.
C．She thinks they are feasible.
D．She thinks they are not instructive enough.
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单项选择题
According to the passage, people in Mexico City are faced with______.
A．serious air pollution
B．economic crisis
C．unemployment
D．natural disaster
单项选择题
What do you know about“power walking”from the passage
A．It is a kind walking people do in the park.
B．It may burn more calories than running.
C．People walk very fast to break into a run.
D．This kind of walking sets a pace for running.
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