原题
录音 1
What does the speaker point out about the keratin plates inside the Indian pangolin's stomach?
AThey are replaced from time to time.
BThey make the animal undesirable to potential predators.
CThey produce chemicals that digest food.
DThey function like teeth do in other animals.
正确答案：D
解题思路
老师暂未填写解题思路。