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What is the most important feature of th

shuhaiku2019-12-17  19
问题 What is the most important feature of the backpack invented by Lawrence C.Rome and his colleagues?
选项 A It produces electricity for electronic devices while the wearer walks.B It can be used as cellphones，GPS in the military actions or field studies.C It is small and convenient.D It is light and easy to carry.
答案A
解析
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