70. The report from NHTSA suggests that         .

A. fewer people were injured in crosswalks

B. crosswalk safety has greatly improved

C. much has been done to reduce traffic accidents

D. pedestrian deaths in crosswalks remain a serious problem

                 E

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

Sleep is something we all do. But some people need to sleep more than others. Babies sleep most of the time. Children in school sleep about ten to twelve hours a night. Most grown-ups sleep only seven or eight hours.    71 

All parts of our bodies have to rest after they work. Our arms need a rest after we lift heavy things. When we run fast, our legs work hard. They get tired. We have to rest them. Our brains work hard, too.    72    We can sit quite still and rest our arms and legs. But our brains aren’t resting. They go right on thinking as long as we are awake.

Our brains slow down a bit when we sleep and dream.  73    Instead of thinking wide-awake thought, our brains make up dreams. Some dreams are very pleasing. Some are not. Most of the time we forget them when we wake up.

Scientists have tried to find out what would happen if people were not allowed to sleep. They asked some people not to go to bed. The people stayed up all night and all the next day. They stayed up the next night, too and the day after. They played games. But they made mistakes. They forgot things.   74   . The people grew rude and mean. They became angry with their friends. Finally they were too tired to stand up. The moment they sat down, they fell asleep.

Scientists found that if people are not allowed to sleep, they act in an unusual way.

   75    But we do know that we need it to stay well.

So tonight have a good sleep. Lie down under the covers. Shut your eyes. Let your thoughts travel about. Soon you’ll stop thinking. You’ll be asleep.

A.  But even as we sleep our brains are doing some work.

B.   It was hard for their tired brains to work.

C.  When we are awake, they help us pay attention to the world around us.

D.  No one knows quite surely why sleep is so good for us.

E.   Good sleep helps to improve one’s memory.

F.   But babies, children and grown-ups ----all of us need to have our sleep.

66. Kristi Holl mentions her experience mainly to        .

A. prove she is a good instructor

B. promote the writing program

C. give her advice on course preparation

D. show she sold more stories than articles

                  D

Cities alarmed by deaths and injuries of pedestrians (行人) are taking efforts to make crosswalks safer for people on foot, especially seniors and children who need more time to cross streets.

    A pedestrian is killed in a traffic accident in the USA every 110 minutes; one is injured every nine minutes, according to official data. Crosswalks can be especially dangerous for the elderly. Among people 70 and older, 36% of pedestrian deaths in 2006 occurred in crosswalks, compared with 21% of those younger than 70, according to the Insurance Institute for Highway Safety.

    The Federal Highway Administration (FHWA) advises that next year States increase by nearly 15% the amount of time traffic lights provide for pedestrians to cross the street after the flashing orange hand appears.

    FHWA spokesman Doug Hecox says reasons for the change include an aging population that needs more time to cross, health conscious Americans walking more, children encouraged to walk to prevent getting overweight and high gas prices pushing people to walk instead of drive.

    Pedestrian deaths went down by 12% from 5, 449 in 1996 to 4,784 in 2006,.But among those in 2006,471 were killed in crosswalks, down slightly from 488 ten years earlier, the National Highway Traffic Safety Administration (NHTSA) says.

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