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 fis

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单项选择题

What can be inferred about the defence mechanisms of the sea cucumber

A．They are very sensitive to surrounding stimuli.
B．They are almost useless.
C．They require group cooperation.
D．They are similar to those of most sea creatures.

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