单项选择题

A．A driving test.
B．A traffic accident.
C．A police movie.
D．The best way to make signals.
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单项选择题
According to the National Science Foundation, there are more than 26, 500 Chinese students studying in U.S.A universities.
A．Y
B．N
C．NG
填空题
A．lengthB．intervalC．periodD．meantime
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