单项选择题

It can be inferred from the passage that______.

A．Americans want to take part in all kinds of activities
B．curiosity is the major characteristic of Americans
C．Americans do not know how to deal with silence
D．Americans' characters are influenced by their social and geographical environments

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单项选择题

What will happen if cars are linked to each other electronically in 2020

A．Motorists will get a clear view of the road.
B．The weather conditions won't influence on motorists.
C．All trains will burn less fuel than the present.
D．There will be a decrease in the pollution caused by car.

单项选择题

It can be implied that the cars of 2020______.

A．will be owned by individuals
B．will improve the condition of traffic
C．will have advanced brake and accelerator
D．can't avoid the happening of accidents