ElectricBackpack Backpacks are convenient. They can hold your books,your lunch,and achange of clothes,leaving your hands free to do other things.Someday,if youdont mind carrying a heavy load,your backpacks might also power your MP31player,keep your cell phone running,and maybe even light your wayhome. The backpacks electricity-creating powers depend onsprings used to hang a cloth pack from its metal frame.The frame sits againstthe wearers back,and the whole pack moves up and down as the person walks.Agear mechanism converts vertical movements of the pack to rotary motions of anelectrical generator,producing up to 7.4 watts. The backpack could be especially useful forsoldiers,scientists,mountaineers,and emergency workers who typically carryheavy backpacks.For the rest of us,power-generating backpacks could make itpossible to walk,play video games,watch TV,and listen to music,all at the sametime.Electricity-generating packs arent on the market yet,but if you do get one eventually,just make sure to look both ways before crossing thestreet! 1. Backpacks are convenient because B they can hold as many things as you want to carry. D you do not have to carry things withyou. and his colleagues? B It can be used as cellphones,GPS in the military actions or field studies. D It is light and easy to carry. A a small stream of water flowing naturally from theearth. C the act or an instance of jumping or leaping. being pushed. A To make the backpackmore comfortable for the wearer. C To test the advantage of the backpack. 5. What is implied in if you do get oneeventually,just make sure to took both A You will be too excited to watch the traffic. C It is notpossible for you to get such a backpack. 答案与题解: 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。 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。
高考英语重点词法击破3
为何你的女性朋友往往比一个男生更重要
高考英语重点词法击破7
巧克力实验:找别人帮忙也没那么难为情
给特朗普的大礼?传俄罗斯或将斯诺登引渡回美国
俄罗斯家暴合法化 女子应为此自豪 WHAT?!
高考英语北师大版一轮复习精品讲练Module5 Unit14《Careers》学案
高考英语北师大版一轮复习精品讲练Module1 Unit3 《Celebration》作业
高考英语知识点+考点+题型+演练(10)
总统出门吃饭,谁付钱
国内英语资讯:6 killed in S. China highway collision
国际英语资讯:Lawyer rules out Russias possible extradition of Snowden to U.S.
高考英语知识点+考点+题型+演练(12)
高考英语北师大版一轮复习精品讲练Module1 Unit1 《Lifestyles》作业
国内英语资讯:Beijing, neighboring regions to see heavy air pollution
高考英语总复习完形填空训练 九
高考英语总复习完形填空训练 八
高考英语知识点+考点+题型+演练(8)
Decline an invitation of a friends party
高考英语知识点+考点+题型+演练(14)
高考英语知识点+考点+题型+演练(13)
高考英语北师大版一轮复习精品讲练Module5 Unit13《People》学案
Decline an invitation of a birthday party
高考英语重点词法击破6
高考英语重点词法击破4
Orangutan squeaks reveal language evolution, says study 科学家称红毛猩猩叫声揭示人类早期语言进化过程
国际英语资讯:Flood, landslide in central Indonesia injure 8, force some 5,000 to flee home
高考英语知识点+考点+题型+演练(15)
高考英语总复习完形填空训练 七
高考英语北师大版一轮复习精品讲练Module6 Unit16《Stories》学案
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |