【单选题】Certainly no creature in the sea is odder than the common sea cucumber. All living creature, especially human beings, have their peculiarities, but everything about the little sea cucumber seems unusu...
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.
【单选题】Certainly no creature in the sea is odder than the common sea cucumber. All living creatures, especially human beings, have their peculiarities, but everything about the little sea cucumber seems unus...