单项选择题

According to the passage, why is the shape of sea cucumbers important

A．h helps them to digest their food.
B．It helps them to protect themselves from danger.
C．It makes it easier for them to move through the mud.
D．It makes them attractive to fish.

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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

What is implied but not directly stated in the passage is that ______.

A．young people have been the leaders in the fight against authority
B．today, jeans are no longer looked down upon
C．jeans are the typical dress of civil rights marchers
D．formerly students were not allowed to wear jeans to class