[读《从字词学习抵达阅读理解》一文有感]在周一贯先生主编的《小学语文文体教学大观》一书中，我读到了莫国夫的一篇文章，心中颇受触动。文中指出： 小学阅读教学承担着识字学词的功能，同时这又是一个双向互动的过程，即识...+阅读
阅读下面的短文。每篇短文的后面有五个问题，每个问题有四个备选答案。请根据短文的内容选择答案。
Electric Backpack
Backpacks are convenient． They can hold your books，your lunch，and a change of clothes，leing your hands free to do other things．Someday，if you don't mind carrying a hey load，your backpacks might also power your MP31 player，keep your cell phone running，and maybe even light your way home．
Lawrence C． Rome and his colleagues from the University of Pennsylvania in Philadelphia2 and the Marine Biological Laboratory in Woods Hole3，Mass．4，he invented a backpack that makes electricity from energy produced while its wearer walks． In military actions，search-and-rescue operations，and scientific field studies，people rely increasingly on cell phones，global positioning system (GPS) 5 receivers，night-vision goggles，and other battery powered devices to get around and do their work． The backpack’s electricity- generating feature could dramatically reduce the amount of a wearer’s load now devoted to spare batteries，report Rome and his colleagues in the Sept．9 Science6．
The backpack’s electricity-creating powers depend on springs used to hang a cloth pack from its metal frame．The frame sits against the wearer’s back，and the whole pack moves up and down as the person walks．A gear mechanism converts vertical movements of the pack to rotary motions of an electrical generator，producing up to 7．4 watts．
Unexpectedly，tests showed that wearers of the new backpack alter their gaits in response to the pack’s oscillations，so that they carry loads more fortably and with less effort than they do ordinary backpacks． Because of that surprising advantage，Rome plans to mercialize both electric and non-electric versions of the backpack．
The backpack could be especially useful for soldiers，scientists，mountaineers，and emergency workers who typically carry hey 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 aren’t on the market yet，but if you do get one eventually，just make sure to look both ways before crossing the street!
词汇:
backpack / 5bAkpAk / n．背包 watt / wCt / n．瓦（特）
receiver / ri5si:vE(r) / n．接收机 gait/ ^eit / n．步态，步法
night-vision goggle 夜视镜 oscillation / 7Csi5leiFEn / n．摆动
spring / spriN / n．弹簧 mercialize/ kE5mE:FElaiz / v．商业化
vertical / 5vE:tikEl / adj．垂直的 mountaineer/ 7maunti5niE(r) / n．登山运动员
rotary / 5rEutEri / adj．旋转的
练习：
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 he 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．
D It is light and easy to carry．
3． 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．
D a length of metal wound around，which returns to its original shape after
being pushed．
4． According to Paragraph 4，what does Rome plan to do?
A To make the backpack more fortable for the wearer．
B To put the backpack on the market．
C To test the advantage of the backpack．
D To promote the backpack in a newspaper or on television．
5． What is implied in “if you do get one eventually，just make sure to took both
ways before crossing the street !”?
A You will be too excited to watch the traffic．
B Enjoying electronic devices while walking may invite traffic accidents．
C It is not possible for you to get such a backpack．
D It is wise of you to he such a backpack．
答案与题解：
1． C 第一段告诉我们，因为背包可以装许多东西，所以可以将双手解放出来做其他事情：to free your hands to do other things。
2． A 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。
3． D “springs"在此是弹簧的意思。spring是一个多义词：泉水(A)、春天(B)、弹跳(C)。
4． B 第四段最后一句的意思是：Rome计划将这种背包商业化，即推向市场。A、C、D在文中均未提到。D的意思是为背包做广告。
5． B 这个句子的字面意思是：如果你终于得到这样的背包，过马路时一定要两面都看看。也就是说，不要因为同时玩着游戏，听着音乐、看着电视，太专注以致不注意来往车辆了。
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