题目
题型：不详难度：来源：
What is a CAT scan? CAT stands for Computerized Axial Tomography(层面X线照相术). It is a special X-ray machine that gets a 360 - degree picture of a small area of a patient"s body.
Doctors use X-rays to study and examine diseases and injuries within the body. X-rays can find foreign objects inside the body or to take pictures of some organs inside if special things as dyes or special liquids are added to the organs to be X-rayed.
A CAT scanner, however, uses a beam(光束) of X-rays to give a cross-sectional view of a particular part of the body. A fine beam of X-rays is scanned across the body and circled around the patient from many different angles(角度). A computer analyzes(分析) the information from each angle and produces a clear cross-sectional picture on the screen. This picture is then photographed for later use. Several cross-sections, taken one after another, can give a clear "photo" of the entire body or of any body organs. The newest CAT scanners can even give a clear picture of active, moving organs just as a fast-action camera can "stop the action" giving clear pictures of what appear only mistily(模糊) to the eye. And because of the 360 - degree pictures, CAT scans show 3-dimensional views of organs in a manner that was once only seen during surgery or autopsy (examining a dead body).
小题1:According to the first two paragraphs, doctors can see the inside of a patient"s body by ______.
| A．giving the patient an operation |
| B．checking body organs |
| C．getting a 360-degree picture of a small area of a patient"s body |
| D．examining the CAT |
| A．the newest pictures become more misty |
| B．many pictures can be taken at the same time |
| C．the information about the scanned patient is not highly valued |
| D．some pictures of the scanned parts of the body are developed for further examinations in the future |
| A．Modern X-ray | B．Three-dimensional View |
| C．Fast - moving Camera | D．CAT Scan |
答案
小题1:C
小题2:D
小题3:D
解析
小题1:常规的手术、检查无法透视病人，只有外科手术、尸检、CAT技术才能让医生达到目的。CAT是技术，不是图片，因此选项D错。
小题2:根据最后一段第4句 This picture is then photographed for later use.
小题3:文章主要讲述的是CAT技术在医学上的使用，选项D比选项A更准确。
核心考点
试题【How can you find out what is going on inside a person" s body without opening th】；主要考察你对题材分类等知识点的理解。[详细]
举一反三
Nearly seven percent of boys in the US try steroids before the end of high school, according to a 1988 study by professors Charles Yesalis and William Buckley, of Penn State University. The estimate comes from a poll of 3,400 seniors in 46 public and private schools across the US.
“Abusers of Steroids did it to improve their appearance and to excel at sports,” Professor Yesalis said. “Parents, teachers and coaches make boys believe that to be an ideal male you need to have these. Then they say: ‘you can’t play games to have fun; you play games to win.’”
“Such attitudes put many high school athletes at high risk of becoming abusers of steroids,” said Mike Gimbel, director of Baltimore County Office of substance Abuse. “For these athletes, the pressure to perform is incredible,” he said. “It was inevitable that it would seep down to high school level.”
小题1:The word “big-time” in Paragraph 1 most nearly means “________”.
| A．long time | B．good time | C．top rank | D．modern |
| A．Because they make teenagers grow too tall. |
| B．Because they make teenagers get too big. |
| C．Because they prevent teenagers from getting taller and taller. |
| D．Because they give teenagers too much pressure. |
| A．School athletes have too much pressure. |
| B．Steroids can help people have lots of muscles. |
| C．The pressure chiefly comes from parents, teachers and coaches. |
| D．Girls are not interested in steroids. |
| A．Drugs and Sports |
| B．The Pressure to School Boys are Too Much |
| C．School Boys are Interested in Drugs |
| D．School Athletes Risk Damage from Drugs |
In fact, people taking high doses(剂量)of vitamin E may in some cases be more likely to die earlier, although the reasons are not clear, said Dr. Edgar Miller of Johns Hopkins University in Baltimore, who led the study.“I think people take vitamin E because they think it is going to make you live longer, but this(study)doesn’t support that.”Miller told reporters.
Miller and colleagues reanalyzed 19 studies of vitamin E and health between 1993 and 2004. The tests involved more than 136,000 mostly elderly patients in North America, Europe and China. People who took 200 international units of vitamin E a day or more died at a higher rate during the study, which lasted three years, than people who did not take supplements, they told a meeting of the American Heart Association.“It’s about a 5 percent increased risk at 45 years in the tests combined together，”Miller said.“That doesn’t sound like a lot but if you apply it to 25 percent of the (U.S.)adult population taking vitamin E, that is significant.”
Miller, whose findings are also being published online by the Annals of Internal Medicine, said twothirds of people who take vitamin E supplements take 400 IU or more.“We don’t think that people need to take vitamin E supplements, which they can get enough from the diet,”he said. Nuts, oils, whole grains and green leafy vegetables are all rich in vitamin E.
小题1: People take vitamin E supplements, hoping that________.
| A．they can lose weight easily |
| B．they may live a longer and healthier life |
| C．they can get more and more beautiful |
| D．they no longer need any medicine |
| A．Miller and his team based their research on 19 cases of vitamin E and health between 1993 and 2004 |
| B．Miller thinks it unnecessary for people to take vitamin E supplements |
| C．Miller supposes it impossible for people to get enough vitamin E from their diets |
| D．Miller played an important role in the tests conducted by the researchers |
| A．Nuts. |
| B．Whole grains. |
| C．Green leafy vegetables. |
| D．All of the above. |
| A．It is reported in a study that vitamin E may do more harm than good to people to live longer and get healthier. |
| B．Dr.Edgar Miller and his colleagues studied many cases of vitamin E and health. |
| C．Dr.Edgar Miller advises that people should not depend on vitamin E supplements for longer and healthier lives. |
| D．People who took 200 international units of vitamin E a day or more died at a higher rate than people who did not take supplements. |
In a classic experiment, babies of 6 to 12 months old were placed in a cafeteria（自助） feeding arrangement, with a wide selection of baby food before them．They were given whatever food they pointed to or appeared interested in．We are told that at first they showed some unusual eating patterns, but that over a period of time they managed to select well-balanced diet．
So, in selecting food, rats and babies do seem to know and act on what"s best for them．Apparently, there is a kind of “body wisdom”, which humans soon lose．Most of us do not eat as wisely as we could．Many of our food preferences are culturally determined and influenced by long-established habits．Some people eat fox, dog and blackbirds, while we eat cows and pigs．So what people eat and how much they eat seems to be greatly influenced by what is going on around them．
小题1:In the experiment on rats, a fragrant flavor was added to the rats’ drinking water to _____________ .
| A．encourage rats to drink vitamins-enriched water |
| B．find out rats’ preference in flavor |
| C．test whether rats know which drink is good for them |
| D．demonstrate the vitamins are tasteless |
| A．adults know better than babies what kind of food are good for their health |
| B．adults usually cannot resist the temptation of various delicious foods |
| C．adults" eating habits are closely related to the social and cultural customs |
| D．adults have more choices of food than babies in eating patterns |
| A．eat a balanced diet |
| B．choose the food that is of nutrition |
| C．have the habits influenced by the surroundings |
| D．like to eat the food with a fragrant flavor． |
| A．both have the wisdom to choose a balanced diet |
| B．both prefer flavored food and drink |
| C．both have the same eating patterns |
| D．both develop a taste for the same kinds of flavors |
Insufficient sleep is linked with changes in hormone levels that may stimulate（刺激）appetite. A series of studies in recent months have shown that the less people sleep, the heavier they tend to be.
American researcher Robert Vorona from Eastern Virginia Medical School in Norfolk and colleagues have now examined the relationship between people"s self-reported sleep time per 24 hours and their body mass index(BMI). They found that total sleep time and BMI were inversely correlated was total sleep time decreased, BMI increased, except in the severely obese group." Americans experience insufficient sleep and corpulent bodies. Clinicians are aware of the burden of obesity on patients," the study said. "Our findings suggest that major extensions of sleep time may not be necessary, as an extra 20 minutes of sleep per night seems to be associated with a lower body mass index," it added. "We warn that this study does not establish a cause-and-effect relationship between restricted sleep and obesity (but) investigations demonstrating success in weight loss via extensions of sleep would help greatly to establish such a relationship."
In November 2004, researchers from Columbia University in New York City, New York demonstrated a clear link between the risk of being obese and hours of nightly sleep, finding that people aged 32 to 59 who slept four hours or less per night were 73% more likely to be obese than people who slept between seven and nine hours per night.
小题1:The research, which was published in the Archives of Internal Medicine, found that____________.
sleeping for a shorter time a day might help fight agianst obesity
an extra 20 minutes’ sleep each night could offer a way to lose weight wothout pain
total sleep time and body mass index were inversely related
people aged 32 to 59 who slept four hours or less per night were 73% more likely to be obese than people who slept between seven and nine hours per night
小题2:How many research results are presented in the text?
| A．Two | B．Three | C．Four | D．Five |
| A．thin | B．fat | C．energetic | D．painful |
| A．Sleeping a little bit longer a day might help fight against obesity |
| B．insufficient sleep is linked with changes in hormone lives |
| C．there exists a clear link between the risk of being obeses and hours of nightly sleep |
| D．the less people sleep , the heavier they tend to be |
At one time, people suffering from the disease were said to be“getting old”.The disease was though to be a natural part of growing old, but it is now known that Alzheimer’s disease strikes young and old alike. It is an organic(器官的)disease that destroys brain cells.
Alzheimer’s disease affects the patient’s memory, speech, and movement. In the beginning stages of the disease, the patient may seem slightly confused. He may have trouble speaking. Then the patient’s memory begins to fail. He may forget dates, telephone numbers, names and plans.
As the disease progresses, the patient may not recognize family and friends. These symptoms(症状)often cause terrible anxiety in the patient. He may feel lost and frightened. Sometimes the patient reacts with wild and bad behavior.
In the last stages of the disease, the patient may not be able to take care of himself. He may have lost the ability to speak and walk.
Scientists don’t know exactly what causes Alzheimer’s disease. It may be caused by a virus(病毒).It may be caused by a poisonous substance(物质)in the environment. At present, there is no cure for the disease. But there are ways to slow its progress. Exercise and physical treatment can help the patients of this disease.
小题1:The main idea of the passage is that Alzheimer’s disease________.
| A．is a terrible part of the aging process |
| B．is an organic disease that affects young and old |
| C．can be cured by physical treatment |
| D．causes forgetfulness |
A. forgetfulness B. difficulty in speaking
.loss of sight D. loss of the ability to walk
小题3:According to the passage, which of the following may be a cause of Alzheimer’s disease?
| A．Poisons produced by the brain. | B．Getting old. |
| C．A virus. | D．Lack of exercise. |
| A．operation | B．a change in environment |
| C．medicines | D．physical treatment and exercise |
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