单项选择题

A．People in the countryside have to work harder to make a living~
B．The national social and economic progress will be hindered.
C．There will be a crisis between rural and urban residents.
D．Workers have to find other jobs beyond their regular one.
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单项选择题
A．C-F-C’s are coolants for air-conditioners.B．C-F-C’s arc easy to eliminate.C．Farmers and shippers are usually using methyl bromide to kill insects.D．Ozone layer will recover very soon as long as we stop using methyl bromide and C-F-C’s.
A．C-F-C’s are coolants for air-conditioners.
B．C-F-C’s arc easy to eliminate.
C．Farmers and shippers are usually using methyl bromide to kill insects.
D．Ozone layer will recover very soon as long as we stop using methyl bromide and C-F-C’s.
单项选择题
A．AIDS spreads widely in Africa.B．An educational program reduced the homosexually transmitted cases of AIDS in San Francisco.C．People should alter their basic behaviors to stop the epidemic of AIDS.D．Massive educational programs are costly but very helpful.
A．AIDS spreads widely in Africa.
B．An educational program reduced the homosexually transmitted cases of AIDS in San Francisco.
C．People should alter their basic behaviors to stop the epidemic of AIDS.
D．Massive educational programs are costly but very helpful.
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