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【单选题】"A roiling stone gathers no moss (苔藓)," but there is one living animal that does gather moss, the three-toed sloth (树懒) of South America. This slowest-moving member of the animal kingdom is so inactiv...
A.
to help children to gain a better understanding of animal life
B.
to prove that the saying "a rolling stone gathers no moss" is wrong
C.
to introduce a particular animal to the common reader
D.
to discuss with professionals the laziness of animals