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

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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

单项选择题

One is considered as a color blind man if （）

A．he can see the difference between red and deep red
B．he can see the difference between blue and green
C．he can't tell the difference between orange and green
D．he thinks green is the same as blue