28．According to James Holland，we know that______．

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

B．gadgets can be charged in a loom with wireless power

C．a right charger is needed

D．each room should have wireless power

27．The undedined word "delve"　 in Paragraph 3 refers to______ ．

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

26．What does the writer want to tell us in the passage?

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．

25．The average citizen dislikes the motorcyclists because______

A．all motorcycles are wild young men

B．all motorcycles are irresponsible young men

C．all motorcycles are lawless young men

D．they frequently look dirty，they often make an unpleasant noise，and their appearance contributes to people's terrible imagination

B

No more batteries，no more chargers and no more wires．This is the future promised by　 "wireless power"．a means of broadcasting electricity through the air to laptops，iPods 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 Consumer Electronics Show，the world's biggest gadgets tradeshow．

Experts believe this is just the beginning and that 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 awkwardly 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 Eleetricpig．co．uk．"If each room had wireless power，you'd know that once you walked through the front door your nmbile 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 ambitions technology at CES is PowerBeam．Its system turns electricity into an invisible laser,then beams(传播) it as heat，across the room to a solar cell that conveys it back into dectricity．

David Graham，the co-founder of PowerBeam，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 of power to_a solar．cell 10 meters away．This,sould 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)．

PowerBeam 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 through the beam，itwould shut down within a thousandth of a second，then restart once the path is clear．The technology also promises because it would only power products when needed．

24．Some people claim that a man on a motorcycle is safer than a man in a car because______.

A．car race is a sport with several disadvantages

B．motorcyclists must drive very carefully

C．most people want to keep a distance from the dirty motorcycles for fear that they should lose dignity

D．motorcycles tend to be accepted by more and more people

23．It Can be inferred that______

A．there existed different opinions towards motorcycling sport

B．all good guys in cowboy movies weal white

C．animals in the woods like motorcycles because motorcyclists usually feed crashed insects to them

D．motorcycles will make noise as soon as people go to sleep

22．From the passage we know that good characters of old American movies_____.

A．usually wore lighter colors

B．had no difference from evil characters

C．looked gracious

D．often rode horses

21．According to the passage，the average Americans believe that_____.

A．motorcyclists are all blue-collar workers

B．motorcycling has become one ofAmerica’s most popular sports

C．only wild，irresponsible，lawless young men enjoy motorcycling

D．motorcyclists can't afford to buy cars

19．A．duty　　　　 B．opportunity　　 C.ability　　　　　 D．eourage