单项选择题

（）different opinions as where the word "Okay" came from are mentioned in the text.

A．Four
B．Five
C．six
D．Three

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单项选择题
From the story at the beginning of the passage we know it is dangerous for a driver（）

A．to see red traffic lights
B．not to notice the traffic lights
C．to be color blind
D．not to see the red traffic lights
单项选择题
21（）

A．raised
B．risen
C．placed
D．laid
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