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
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
单项选择题
The idea of this article is that ______.
A．birds are important in our lives
B．animals are important in our lives
C．nature is important in our lives
D．Audubon was especially interested in birds
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