题型：单选题 难度：★★★★★ 
2.8万热度
whenthesharkswimsslowlythefibersarerelaxedandpre-凯发娱乐
when the shark swims slowly, the fibers are relaxed and pressure of them is low.
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题型：单选题 难度：★★★★★ 2.8万热度
when the shark swims slowly, the fibers are relaxed and pressure of them is low.
该题目是单项选择题，请记得只要选择1个答案！
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during the body's back and forth motion, much potential energy will be stored in the fibers.
which is the necessary way to solve women' s poverty
a．popularize national undergraduate education.
b．encourage the occupational persity.
c．promote the fair distribution of social wealth.
d．eliminate gender inequality.
the number that a logger plants trees is much larger than the number of trees removed.
animals live and multiply better in clear-cuts than in areas full of old trees.
clear-cutting means differently to a tree farmer and the public.