单项选择题

The fourth paragraph of the passage primarily discusses ______.

A．the reproduction of sea cucumbers
B．the food sources of sea cucumbers
C．the eating habits of sea cucumbers
D．threats to sea cucumbers' existence
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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
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
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