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Question
Multi-speed axles and auxiliary transmissions are used:
Answers
A.  To make a vehicle run more smoothly.
B.  To provide extra gears.
C.  To get improved gas mileage.
D.  To make a vehicle less noisy.
Explanation
On many vehicles, multi-speed rear axles and auxiliary transmissions are used to provide extra gears. They are usually controlled by a selector knob on the gearshift lever.
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