题目内容：
According to the Duke University scientists, when bending its body in swimming, the shark stretch its collagen fibers to the greatest extent.参考答案：【答案仅供学习，请勿对照自行用药等】
答案解析：
简答题：According to the Duke University scientists, when bending i
- 题目分类：英语四级
- 题目类型：简答题
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