英语四级

单选题During the body's back and forth motion, much potential energy will be stored in the fibers.

参考答案：G进入在线模考
信息明示题。题干：当身体前后移动时，许多潜在的能量被储存在纤维中。题干关键词是body’s back and forth motion和much potential energy。G段提到During me body’s back and forth motion．fibers along the outside part of the bending body stretch greatly．Much potential energy is stored in the fibers．与题干吻合，故选G。

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