单项选择题

A．Being able to do the field work.
B．Specializing in one area.
C．Knowing large areas generally.
D．Being concerned about environmental problems.
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单项选择题
A．Because she will have the hottest weather then.B．Because neither she nor her husband work then.C．Because Portugal is the most beautiful then.D．Because it is less expensive to travel then.
A．Because she will have the hottest weather then.
B．Because neither she nor her husband work then.
C．Because Portugal is the most beautiful then.
D．Because it is less expensive to travel then.
单项选择题
A．Automobile safety.B．Increasing fuel efficiency.C．California’s pollution laws.D．Electric-powered cars.
A．Automobile safety.
B．Increasing fuel efficiency.
C．California’s pollution laws.
D．Electric-powered cars.
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