单项选择题

A．

B．

C．

D．

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世界上第一个柴油机是以石油作为燃料
A、正确
B、错误

答案：错误

单项选择题

Why do London cab drivers always know the quickest routes through London’s road network?
A、 Because they have been a cab driver for a very long time.
B、 Because they are all local people.
C、 Because they have to pass a very difficult test.
D、 Because they use traffic apps.