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Electric cars Electronic vehicles have been around for more than a hundred years. More than three million all-electric cars and （1）           are now on the road worldwide.
Environmentally friendly	They don't burn gasoline.（汽油） Strong batteries run their electric engines. They don't directly produce greenhouse gases.
Problems and improvement	Their range is （2）           . Now their range is improving. Finding a place to （3）           the batteries is another problem. The number of charging stations is going up.

（1）A.buses
B.trucks
C.bicycles
（2）A.uncertain
B.low
C.limited
（3）A.recharge
B.change
C.repair