题目内容（请给出正确答案）

[主观题]

According to the Duke University scientists, when does the shark stretch its colla

gen fibers to the greatest extent？

A．When moving its tail rapidly.

B．When finding its preys.

C．When staying without any movement.

D．When bending its body in swimming.

提问人：网友piao2008yq 发布时间：2022-01-06

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