单选题：What is the most important feature of the backpack invented

题目分类：理工类
题目类型：单选题
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题目内容：

What is the most important feature of the backpack invented byLawrence C.Romeand his colleagues? A．It produces electricity forelectronic devices while the wearer walks.
B．It can be used as cellphones, GPS in the military actions or field studies.
C．It is small andconvenient.
D．It is light and easy to carry.

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