单项选择题

According to the first paragraph, what is a relatively new focus in archaeology

A．Investigating the recent past.
B．Studying prehistoric cultures.
C．Excavating ancient sites in what is now the United States.
D．Comparing findings made in North America and in Europe.
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单项选择题
Jeans, originally designed by Levi Strauss, ________.
A．have become a symbol of the fashionable class
B．have come to symbolize changes in social attitude
C．are suitable wear for rough work only
D．are no longer so popular as they used to be
单项选择题
The author is of the opinion that ________.
A．jeans are likely to be a short-lived fashion
B．jeans are popular only in the United States
C．jeans are likely to be popular for a long time to come
D．jeans are no longer fashionable
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