The backpack could be especially useful for soldiers, scientists, mountaineers, and emergency workers who typically carry heavy backpacks. For the rest of us, power-generating backpacks could make it possible to walk, play video games, watch TV, and listen to music, all at the same time. Electricity-generating packs arent on the market yet, but if you do get one eventually, just make sure to look Both ways before crossing the street!

　　41. Backpacks are convenient because

　　A they can be very large.

　　B they can hold as many things as you want to carry.

　　C your hands are freed to do other things.

　　D you do not have to carry things with you.

　　42. What is the most important feature of the backpack invented by Lawrence C. Rome and his colleagues?

　　A It produces electricity for electronic devisees 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.

　　43. The word springs in Paragraph 3 means

　　A a small stream of water flowing naturally from the earth.

　　B the season of the year, occurring between winter and summer.

　　C the act or an instance of jumping or leaping.

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