单项选择题

What kind of color makes people think of danger（）

A．Red.
B．Green.
C．Yellow.
D．Black.

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单项选择题
According to the passage, which of the following statements is true（）

A．Black stands for unhappiness.
B．Black makes people think of night.
C．Black makes people think of sorrow.
D．Black is the color of the mournin
单项选择题
Among the traffic lights, red light is placed （）

A．at the bottom
B．in the middle
C．at the top
D．below the green light
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