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  3. Backpacks are convenient because What is the most important feature of the backpack invented by Lawrence C. Rome and his collea

Backpacks are convenient because What is the most important feature of the backpack invented by Lawrence C. Rome and his collea

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问题 Backpacks are convenient because
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 cell phones, 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 第二段的第一句说，Lawrence C. Rome及其同事们发明的这种背包，当背着背包走路时，会有电能产生；该段最后一句告诉我们，背包的这种性能可减少背包的重量，因为不必携带备用电池。
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