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30.Why did the author mention "crocodile tears"in paragraph 4? A.To explain why crocodiles have tears. B.To introduce the interesting expression. C.To show the emotional function of tears. D.To appeal to people to help crocodiles. 31.How can we benefit from the study on tears? A.It may help treat eye diseases. B.We can figure out the composition of tears. C.Endangered animals can be protected from extinction. D.More knowledge about how to clean eyes can be obtained.