根据示例改写句子Example:I am ready.Are you ready?
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1.What is this reading mainly about?
A. how color influences our lives
B. the various sources for extracting color
C. how views about colors have changed
D. how certain colors can have a calming effect
2.The first non-natural colors were produced_____.
A. many centuries ago
B. in the nineteenth century
C. in the twentieth century
D. only recently
3.According to the passage, which color can give a sports team a competitive advantage?
A. black
B. yellow
C. blue
D. red
4.Which color has been used to help children study better?
A. yellow
B. red
C. blue
D. pink.
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