Driving while talking on a hand-held mobile phone has long been considered a dan

  Driving while talking on a hand-heldmobile phone has long been considered a danger. But even drivers who use handsfree devices are a nuisance – because they are slowing everyone else down,according to a study.

David Strayer, a psychology professor inUtah University’s traffic lab, conducted a study involving 36 universitystudents driving on motorways. Each used a hands free phone for half the tripbut not for the other half. The students were told to obey posted speed limitsand use turn signals but the rest of the driving decisions were up to them .What Strayer found is that when the drivers were distracted（使分心）by a phone conversation ,they made fewer lane（车道） changes, drove slower and took longer to get where they were going.Fellow researcher Professor Peter Martin, who teaches civil and environmentalengineering at Utat University, said,“Ordinarily a slower driver should besafer ， but that’snot the case when people are talking on a cell phone.”

In general , drivers who used mobile phoneswhile driving took three percent longer to drive along the same high-densityroute than drivers who didn’t. When stuck behind a dawdling(磨蹭的) driver , it took thembetween 25 and 50 seconds longer to switch to an open lane to overtake. Thosedelays can add up when you consider studies that suggest as many as 10 percentof US drivers are using a cell phone at any one time. And delays in trafficstreams of very small amounts can grow into massively when drivers are crossinga  highway.” Our next step is to use computer models to determine just howmuch those delays are costing drivers in time and in extra fuel costs,” Martrinsaid.

63. What does the underlined word in thefirst paragraph mean?

A. A person who is avolunteer.         B. A person whobreaks the traffic law

C. A person who is annoyed byothers.   D. A person who causes trouble

64. Which of the following is TRUE ,according to Martin?

A. The more slowly a person drove, thesafer he was.

B. Measures should be taken to stop usingmobile phones.

C. Drivers using hand-held phones had lesseffect on traffic than those using hands free phones

D. Driving while using mobile phones couldcost drivers time and money.

65. The passage is mainly about      .

A. traffic conditions in rush hours 

B. the use of mobile phones in the USA

C. using hands free devices behind thewheel

D. a comparison between hand-held phonesand hands free ones

试题答案

【答案】

63—65 DDC

【解析】略