单项选择题

What can be inferred about the defense 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.

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单项选择题

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

A．It 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.

单项选择题

Which of the following would NOT cause a sea cucumber to release its internal organs into the water

A．touch.
B．Food.
C．Unusually warm water.
D．Pollution.