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【单选题】
车辆起步前观察四周，确认无妨碍安全行车障碍后，( )。A.
先松手制动后起步
B.
先打转向灯后起步
C.
先呜号后起步
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【单选题】听力原文：M: I must point out the trials of new medicine are expensive and you can never guarantee success. W: But there is a very good chance in this case. I do hope you'll go ahead in view of the potenti...
A.
A prediction of the future of mankind.
B.
A new drug that may benefit mankind.
C.
An opportunity for a good job.
D.
An unsuccessful experiment.
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A.
The woman should get another job.
B.
The woman was mistaken.
C.
The man won't have to wait much longer.
D.
The man was waiting in the wrong place.
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【简答题】A: Any good news? B: Not really. 小题1: So I was left behind after school yesterday. A: 小题2: B: Sometimes I do. The day before yesterday, I was quiet in my history class but I still had to stay after sc...
【简答题】4 熔断器在电路中主要起 保护作用,用于保护线路。熔断器的熔体 于被保护的电路中。
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