Unexpectedly，tests showed that wearers of the new backpack alter their gaits in response to the packs oscillations，so that they carry loads more comfortably and with less effort than they do ordinary backpacks.Because of that surprising advantage，Rome plans to commercialize botb electric and uonelectric versions of the backpack.

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

　　1.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.

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

　　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.

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