填空题

A teacher has a wide (vary) of duties.

【参考答案】

variety
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单项选择题
The main purpose of the passage is .
A．to tell us how expert drivers try to save gas
B．to tell us how to drive a car properly
C．to tell us how to make a car run smoothly
D．to tell us how to make your car consume less gas
填空题
mechanical engineer
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