单项选择题

A．optimistic about
B．pessimistic about
C．not enthusiastic about
D．devoted to
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单项选择题
A．nothing technicalB．electricity is too expensiveC．the speed of the car is not fast enoughD．the weight of the battery
A．nothing technical
B．electricity is too expensive
C．the speed of the car is not fast enough
D．the weight of the battery
单项选择题
A．the efficiency of the engines has improved a lotB．the engines are more powerfulC．people like driving fastD．highways provide enough chances for fast driving
A．the efficiency of the engines has improved a lot
B．the engines are more powerful
C．people like driving fast
D．highways provide enough chances for fast driving
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