单项选择题

What did some people think the Wright brothers were doing

[A] They were playing with kites.
B. They were doing something dangerous.
C. They were doing scientific experiments.

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热门试题

单项选择题

A. It’s easy to talk about personal matters.
B. It’s a good way to pass time.
C. It’s quick to get information.

单项选择题

A．important
B．valuable
C．special
D．useful

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