题目内容
（请给出正确答案）
A.$50.
B.$75.
C.$100.
D.$150.
E.$225.
参考答案
简答题官方参考答案
（由简答题聘请的专业题库老师提供的解答）
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更多“Donna can make a chair for about $100, she charges customers $150 to buy the chair, and customers pe…”相关的问题
A.She keeps Donnas birthday in mind.
B.She wants to buy Donna a CD.
C.She wants to give Donna money.
D.She cant make a decision,
A．Don"t be so sure.
B．I" m happy to have done it.
C．I"m glad you like it.
D．You are welcome.
How does eBay make money from its website？
A.By bringing sellers together．
B.By charging for each sale．
C.By listing items online．
D.By making e-photos．
A.supposed
B.reclaimed
C.publicized
D.advertised
Electric Backpack
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 don't mind carrying a heavy load, your backpacks might also power your MF3 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 Philadelphia and the Marine Biological Laboratory in Woods Hole, Mass., have 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) 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 Science.
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 comfortably and with less effort than they do ordinary backpacks. Because of that surprising advantage, Rome plans to commercialize 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 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 lime. 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!
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.
It can be inferred from the last paragraph that Christopher______.
A．was more likely to change his mind
B．would return to his office in the bank
C．made a big success in interior design
D．was not well-prepared for his business
Electric Backpack
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 don't 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.
Lawrence C. Rome and his colleagues from the University of Pennsylvania in Philadelphia and the Marine Biological Laboratory in Woods Hole, Mass. , have 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) 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 Science.
The backpack's electricity-crew, ring 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 comfortably and with less effort than they do ordinary backpacks. Because of that surprising advantage, Rome plans to commercialize 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 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 aren't on the market yet, but if you do get one eventually, just make sure to look both ways before crossing the street!
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.
From the passage we can learn that______.
A．Amy has never recovered from the shock
B．Amy changed her job after the accident
C．Amy lost her memory after the accident
D．Amy has lived quite a normal life
What we can learn from the article. (More than one correct answer.)
A.Cultures never change.
B.Cultures shift, incrementally and constantly, in response to external and internal changes.
C.Culture is a form. of protection that has evolved from situational pressures.
D.Culture can’t prevent “wrong thinking” and “wrong people” from entering the organization in the first place.
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