Question

No more batteries, no more characters and no more wires．This is the future promised by “wireless power”, a means of broadcasting electricity through the air to laptops, Pods and other gadgets（小器具）without the need for cables and sockets（插座）．

  Wireless lighting, audio speakers and digital picture frames are expected to be among the first commercial products exhibited in Las Vegas this week at the International Constumer Electronics Show, the world’s biggest tradeshow．

Experts believe this is just the beginning and eventually wireless electricity could do for battery life what WiFi （局域网）did for the Internet．In a world without wires, laptop users in cafes and airport terminals（终点站）would be inside an “electricity hotspot” and no longer have to_delve an awkward located socket．

“You’d be able to buy a desk that charged any gadget placed on it, or power any PC you put on top,” said James Holland , editor of gadgets website Electric pig．co．uk “If each room had wireless power, you’d know that once you walked through the front door your mobile would start charging up---- even while still in your bag or pocket．You’d never need to hunt for the right charger again．”

Among the companies showcasing the ambitious technology at CES is Power Beam．Its system turns electricity an invisible laser, then beams （传播）it, as heat, across the room to a solar cell that converts it back into electricity．

David Graham ,the co-founder of  Power Beam, said: “We’re going to delete the word ‘recharge’ from the English dictionary．If your cell phone is recharging on your desk all day, you won’t be thinking about it．” The Silicon Valley company can currently use a laser to generate about 1．5 watts power to a solar cell 10 meters away． This would be enough to power an electronic speaker or small LED（二极管） lights, but not enough to operate a laptop, which requires about 30 to 50 watts．However, Graham said that the technology could comfortably be scaled up （提高）.

Power Beam insists its laser does not lead to a risk to users’ health because it is simply moving heat from one place to another．Graham said that, if someone walked throe the beam, it would shut down within a thousandth of second, then restart once the path is clear．The technology also promises because it would only power products when needed．

1．What does the instrument used for charging?

A．A wireless instrument used for charging

B．The only company to show the ambitious technology

C．A means of broadcasting electricity to gadgets

D．A new efficient energy

2．The underlined word “ delve” in Paragragh 3 refers to___

A．hunt for                B．look into                C．think of          D．put away

3．According to James Holland ,we know that_____．

      A．a cell phone can be powered only on a desk

B．gadgets can be charged in room with wireless power

C．a right charger is needed

D．each room should have wireless’s power

4．Which of the following statements is true ?

A．The laser does harm to people’s health

B．The gadgets like audio speakers have shown at the International Consumer Electronics Show this week．

C．The word ‘recharge ‘ has been deleted from the English dictionary．

D．The technology can also save energy because it would not work when unnecessary．

5．The fifth paragragh mainly tells us ______

A．how the system works

B．how the electricity be converted into heat

C．the function of the ambitious technology

D．the electricity is converted through heat

Answer 1

CABDA