Electric Backpack
1. Backpacks are convenient. They can hold your books, your lunch, and a change of clothes, leaving your hands free to do other things. Someday, if you dont mind carrying a heavy load, your backpacks might also power your MP3 player, keep your cell phone running, and maybe even light your way home.
3. The backpacks electricity-creating powers depend on springs used to hang a cloth pack from its metal frame. The frame sits against the wearers 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).
5. 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!
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 with you.
A) It produces electricity for electronic devices while the wearer walks.
C) It is small and convenient.
3. The word springs in Paragraph 3 means ____________.
B) the season of the year, occurring between winter and summer.
D) a length of metal wound around, which returns to its original shape after being pushed.
A) To make the backpack more comfortable for the wearer.
C) To test the advantage of the backpack.
5. What is implied in if you do get one eventually, just make sure to look both ways before crossing the street!
B) Enjoying electronic devices while walking may invite traffic accidents.
D) It is wise of you to have such a backpack.
1. 首先解读标题：ElectricBackpack背包是大家日常生活中很熟悉的东西，但电子背包没听说过。带着一份好奇，通读一遍原文，大致了解，电子书包除了大家知道的普通功能之外，科学家还打算让它具有更多更新的功能。虽然现在市场上还买不到，但总有一天会走进我们的生活，为我们带来更多便利的。
1. Backpacks are convenient because___________.
B) They can hold as many things as you want to carry.你想带多少东西，背包就能装多少东西
D) You do not have to carry things with you. 你不用随身携带东西了。
文章一开头，就提到Backpacks are convenient.所以，我们一起把第一段读完：They can hold your books, your lunch, and a change of clothes, leaving your hands free to do other things. Someday, if you dont mind carrying a heavy load, your backpacks might also power your MP3 player, keep your cell phone running, and maybe even light your way home.
3.看第二题：
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. 它又小又方便。
题目的意思：由Lawrence和他的同事所发明的背包最重要的特征是什么?这是一道细节题。一起读第二段：
通过对这一段的学习，我们知道了这种背包最重要的特性就是：当背上它的人一边走就会一边产生电能。所以答案为A。
3. The word springs in Paragraph 3 means ____________.
B) the season of the year, occurring between winter and summer.一年中的一个季节，介于冬季和夏季之间
D) a length of metal wound around, which returns to its original shape after being pushed. 来回绕的一段金属，在被挤压后能回复它的原形
The backpacks electricity-creating powers depend on springs used to hang a cloth pack from its metal frame.