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.

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热门试题

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.

单项选择题

The disappearance of old style hotel porters can be attributed to the fact that ______.

A．few people are willing to do this type of work
B．machines are more reliable than human beings
C．the personal touch is appreciated less nowadays
D．automation has provided cheaper alternatives