单项选择题

Which of the following is the best title for this passage

A．The development of Universal Time.
B．Different ways to measure time.
C．Why we measure time the way we do.
D．How the calendar came into being.
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单项选择题
Why does the author mention Davy Crockett in Paragraph 1
A．Because this is an example of the type of people among whom demands for portraits were constant.
B．Because Davy Crockett was a famous artist who would hold a display in his Boston gallery.
C．Because this is an example of the way artists used to attract attention and business.
D．Because gallery owners used to have famous people as customers.
单项选择题
What might be discussed after the last paragraph
A．American artists established themselves in other countries.
B．Other ways artists tried to succeed.
C．Foreign artists controlled the American art market.
D．Portraits would be replaced by photographs.
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