单项选择题

The main idea of this passage is ______.

A．color preference has something to do with one's character
B．colors have effects on human psychological states
C．you will know your friends or your enemies by knowing the colors they like
D．all of the above

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单项选择题

Psychologists study the meaning of color preference because ______.

A．colors may affect the emotional states of the people
B．colors may decide the results of our work and study .
C．color preference can tell you who your friends are
D．color preference can help you to see through your enemies

单项选择题

Which of the following statements is TRUE according to the passage ______.

A．It is no proper to wear a red dress in summer.
B．We feel happier and more active when we see light and bright colors.
C．All the machines in a factory are painted orange.
D．No machines in a factory are painted black.