单项选择题

A．By listening to documentaries.
B．By watching TV commercials.
C．By watching foreign movies.
D．By listening to foreign songs.
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单项选择题
A．The government has adopted many effective ways to stop pollution.B．The government can’t prevent pollution completely because of development.C．There are no effective purifying devices to prevent or stop pollution.D．The government won’t control pollution even for tile sake of people’s health.
A．The government has adopted many effective ways to stop pollution.
B．The government can’t prevent pollution completely because of development.
C．There are no effective purifying devices to prevent or stop pollution.
D．The government won’t control pollution even for tile sake of people’s health.
填空题
To effectively promote relationships between negotiator and hostage-taker, ______ must appear as credible to the captor.
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