单项选择题

Our preferences for certain colors are ______.

A．associated with the time of day
B．dependent on our characters
C．linked with our primitive ancestors
D．partly due to psychological factors
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单项选择题
If people are exposed to bright red, which of the following things does NOT happen
A．They breathe faster.
B．Their blood pressure rises.
C．They feel afraid.
D．Their hearts beat faster.
单项选择题
Which of the following statements is NOT true according to the passage
A．Color probably has an effect on us which we are not conscious of.
B．Yellow fire engines have caused many bad accidents in some advanced communities.
C．People exposed to pure blue start to breathe more slowly.
D．The psychology of color is of some practical use.
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