单项选择题

A．He becomes more independent.
B．He becomes more challenging.
C．He becomes more observant.
D．He becomes more optimistic.
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单项选择题
A．It will reduce the amount of pollutants in the air.B．It will increase the amount of unpleasant odors from vehicles.C．It will eventually destroy the ozone layer.D．It will reduce the cost of running large vehicles.
A．It will reduce the amount of pollutants in the air.
B．It will increase the amount of unpleasant odors from vehicles.
C．It will eventually destroy the ozone layer.
D．It will reduce the cost of running large vehicles.
单项选择题
A．He has been shopping around.B．He has been looking for a job.C．He has been dining in a restaurant.D．He has been driving the cab.
A．He has been shopping around.
B．He has been looking for a job.
C．He has been dining in a restaurant.
D．He has been driving the cab.
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