Researchers have found more evidence that suggests a relationship between races (种族) and rates (率) of lung cancer among smokers. A new study shows that black people and Native Hawaiians are more likely to develop lung cancer from smoking. It compared their risk to whites, Japanese-Americans and Latinos.

Researchers at the University of Southern California and the University of Hawaii did the new study. The New England Journal of Medicine published the findings. The eight-year research studied more than 180,000 people. They included present and former smokers and people who never smoked. Almost 2.000 people in the study developed lung cancer.

Researchers say genetics (遗传学) might help explain the racial and ethnic（种族的） differences. There could be differences in how people's bodies react to smoke. But environmental influences, including the way people smoke, could also make a difference.

African-Americans and Latinos in the study are reported smoking the fewest cigarettes per day. Whites are the heaviest smokers. But the scientists point out that blacks have been reported to breathe cigarette smoke more deeply than white smokers. This could fill their lungs with more of the chemicals in tobacco that cause cancer.

Scientists know that some diseases effect different groups differently. And some drug companies have begun to develop racially targeted (针对) medicines. Last June, the United States Food and Drug Administration approved a drug designed to treat heart failure in black patients. The name is BiDil. The agency called it "a step toward the promise of personalized medicine."

1.Researchers agree that it is     that may probably determine black people’s risk of lung cancer.

A．the larger amount of smoking than white people

B．the living style or habit of the blacks

C．the depth of cigarette smoke into their lungs

D．the physical strength to react to cigarette smoke

2.People in the new study are made up of         .

A．heavy smokers in America                B．smokers and non-smokers

C．the Asians and Hawaiians                  D．the black and white people

3.The production of BiDil referred to in the last paragraph is to     .

A．explain different races react to some diseases differently

B．tell the readers that racial differences exist in smokers

C．show a big step people have taken in the medicine area

D．support the idea that it is easy for blacks to have cancers

4.Which of the following statements is TRUE according to the author?

A．The way of smoking may increase the risk of lung cancer.

B．Race has nothing to do with the risk of having a lung cancer.

C．The research was started by the New England Journal of Medicine.

D．he risk of lung cancer lies I how much a person smokes.

 

It doesn't matter when or how much a person sleeps, but everyone needs some rest to stay alive. That's what all doctors thought, until they heard about Al Herpin.

　　Al Herpin, it was said, never slept. He was 90 years old when doctors came to his home in New Jersey. They expected to find out that he needed sleep of some kind. But they were surprised. Though they watched him every hour of the day, they never saw Herpin sleeping. He did not even own a bed. He never needed one.

　　The closest that Herpin came to resting was to sit in a rocking chair(摇椅) and read some news papers. The doctors were puzzled by this strange continuous sleeplessness. Herpin offered the only probable explanation of his condition. He remembered some talk about his mother having been injured several days before he was born.

The point of this story is that _______.

　A. We needn't feel surprised to find someone who doesn't sleep

　B. one person was found who actually didn't need any sleep

C. everyone needs some rest to stay alive

　D. not sleeping may help one to live longer

After watching him closely, the doctors believed that Al Herpin _______.

　A. needed some kind of sleep   　B. slept while one was watching

　C. needed no sleep at all  　　　D. nearly slept in a rocking chair

One suggested explanation of Herpin's sleeplessness was _______.

　A. his old age  　　　

B. his not having a bed

　C. his magnificent physical condition

　D. his mother's injury while carrying him

The writer of the story obviously thinks that Al Herpin's sleeplessness ___.

　A. could be cured  　　　B. could be explained

　C. was healthful   　　　D. was uncommon　　

It doesn't matter when or how much a person sleeps, but everyone needs some rest to stay alive. That's what all doctors thought, until they heard about Al Herpin. Al Herpin, it was said, never slept. Could this be true ? The doctors decided to see this strange man themselves.

Al Herpin was 90 years old when the doctors came to his home in New Jersey. They thought for sure that he got some sleep of some kind. So they stayed with him and watched every movement he made. But they were surprised. Though they watched him hour after hour and day after day. They never saw Herpin sleeping. In fact, he did not even own a bed. He never needed one.

The only rest that Herpin sometimes got was sitting in a comfortable chair and reading newspapers. The doctors were puzzled by this strange continuous sleeplessness. They found only one answer that might explain his condition. Herpin remembered some talk about his mother having been injured several days before he was born. But that was all. Was this the real reason ? No one could be sure. Herpin died at the age of 94.

1. The main idea of this passage is that _______.

A. large numbers of people do not need sleep

B. a person was found who actually didn't need any sleep

C. everyone needs some sleep to stay alive[来源:.COM]

D. people can live longer by trying not to sleep

2.The doctors came to visit Herpin, expecting to _______.

A. cure him of his sleeplessness　　

B. find that his sleeplessness was not really true

C. find a way to free people from the need of sleeping

D. find out why some old people didn't need any asleep

3.After watching him closely, the doctors came to believe that Al Herpin _______.

A. was too old to need any sleep                     B. often slept in a chair

C. needed no sleep at all                         D. needed some kind of sleep

4.One reason that might explain Herpin's sleeplessness was _______.

A. that he hadn't got a bed　

B. that he had gradually got tired of the sleeping habit

C. his mother's injury before he was born　　　　

D. his magnificent physical condition

 

It doesn’t matter when or how much a person sleeps, but everyone needs some rest to stay alive. That’s what all doctors thought, until they heard about Al Herpin. Al Herpin, it was said, never slept. Could this be true? The doctors decided to see this strange man themselves.

    Al Herpin was 90 years old when the doctors came to his home in New Jersey. They thought for sure that he got some sleep of some kind. So they stayed with him and watched every movement he made. But they were surprised. Though they watched him hour after hour and day after day, they never saw Herpin sleeping. In fact, he did not even own a bed. He never needed one.

    The only rest that Herpin sometimes got was sitting in a comfortable chair and reading newspapers. The doctors were puzzled by his strange continuous sleeplessness. They asked him a lot of questions, hoping to find an answer. They found only one answer that might explain this question. Herpin remembered some talk about his mother having been injured several days before he was born. But that was all. Was this the real reason? No one could be sure.

Herpin died at the age of 94.

The doctors came to Herpin’s home in order to __________.

       A. treat him for his illness

       B. find the reason why some old people didn’t need any sleep.

       C. get some proof to show his sleeplessness was not really true.

       D. help him to have a rest in some day.

After watching him closely, the doctors came to believe that Al Herpin ________.

         A. needed some kind of sleep.

         B. needed no sleep at all.

         C. was too old to need any sleep.

         D. often slept in a chair.

Al Herpin’s condition could be regarded as ___________.

       A. an unusual one                 B. a common one

       C. very healthy                     D. very funny

The main idea of this passage is that ____________.

       A. large numbers of people do not need sleep

       B. everyone needs some sleep to stay alive

       C. people can live longer by trying not to sleep at all

       D. a person was found who actually didn’t need any sleep

Memory is the ability to keep track of things that have happened in the past. Memory really is learning. One needs memory to ride a bicycle. A dog needs to remember if it is to come when called.
Memory is said to be stored in the brain as a “memory trace（记忆痕）.” What makes up this trace is not known. Some scientists believe that certain chemical substances may carry certain memories. For example, one substance, when given to rats, causes them to fear the dark.
Other research into memory has to do with how the brain works. Psychologists use three means to find out how a person remembers. For example, give a person a grocery list. Let the person memorize the list, then put it away. The most natural way to find out how much a person remembers of the grocery list is to ask what he or she remembers. This is called the method of recall. Another method is called recognition. Give the person another grocery list. Ask him or her to choose items on the first list from the items that are on only the second list. Often a person will be able to recognize things that he or she cannot recall. A third method of finding how much a person remembers is called relearning. Here the person is asked to read over the first list. The person will probably learn the list the second time faster than he did the first time. The difference in the time it takes to relearn the list is thought of as a measure of how much a person has remembered.
One way of remembering something is to repeat it many times. Interest is very important. Boring lists of facts are much more difficult to remember than something that we understand and are interested in. Motivation, or wanting to do something, is also important. Motivation is linked with reward. For example, a hungry animal quickly learns how to do something if that action gets the animal food. In humans, wanting to learn is often motivation. The praise of a teacher or the knowledge that an answer is correct is rewarding.
【小题1】We can learn from the 2nd paragraph that ___________       .

A．bad memories may cause rats to fear the dark

B．it is hard to tell what a memory trace consists of

C．chemical substances carry certain memories

D．memory is stored in the brain as a substance

【小题2】The way to pick out the items on the first list from the second is known as ________ .

A．recognition

B．recall

C．memorization

D．relearning

【小题3】What is considered as a measure of how much one has remembered?

A．The length of the list.

B．The type of list items.

C．The time difference of relearning.

D．The time difference of brain working.

【小题4】A good way to train an animal to do something quickly is to ________.

A．make the action easy	B．praise it in words
C．reward it with food	D．weaken its motivation