How can you find out what is going on inside a person' s body without opening the patient up? Regular X-rays can show a lot. CAT scans can show even more. They can give three-dimensional(三维) view of body organs(器官).
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).

  1. 1.

    According to the first two paragraphs, doctors can see the inside of a patient's body by ______.

    1. A.
      giving the patient an operation
    2. B.
      checking body organs
    3. C.
      getting a 360-degree picture of a small area of a patient's body
    4. D.
      examining the CAT
  2. 2.

    From the last paragraph, we can infer that ______.

    1. A.
      the newest pictures become more misty
    2. B.
      many pictures can be taken at the same time
    3. C.
      the information about the scanned patient is not highly valued
    4. D.
      some pictures of the scanned parts of the body are developed for further examinations in the future
  3. 3.

    The best title of this passage might be ______.

    1. A.
      Modern X-ray
    2. B.
      Three-dimensional View
    3. C.
      Fast - moving Camera
    4. D.
      CAT Scan

Some time people call each other “scared-cat”,but have you ever thought about this expression? When a cat is frightened,its heart starts beating faster,its muscles get tense,and there are changes in the chemicals in its bloodstream.Although the cat doesn't realize this,its body is getting ready for action.If the danger continues,the animal will do one of two things:It will defend itself,or it will run away as fast as it can.
Something like this also happens to people.When we are excited,angry,scared,or aroused by other emotions (feelings),our bodied go through many physical changes.Out hearts beat faster,and our muscled get tense.All of these changes make us more alert and ready to react.We,too get ready to defend ourselves or run.
Human beings,however,have a problem that animals never face.If we give way to our feelings and let them take over,we can get into trouble.Have you ever said something in anger—or hit somebody—and regretted it later? Have you ever shouted at a teacher,told somebody you were lonely,or said you were in love,and then wished later you had kept your mouth shut? It isn't always wise to express your feelings freely.
Does this mean that it's smarter always to hide our feelings? No! If you keep feelings of anger,sadness,and bitterness hidden away or bottled up inside,your body stays tense.Physical illness can develop,and you can feel churned up inside.It can actually be bad for your health.(It isn't good to keep pleasant feelings inside either;all feelings need to be expressed.)
Feelings that you keep all bottled up inside don't just go away.It's as if you bought some bananas and stuck them in a cupboard.You might not be able to see them,but before long you'd smell them.And if you opened the cupboard,chances are you'd see little fruit flies hovering all over them.They'd be rotten.
You can try to treat emotions as if they were bananas in the cupboard.You can hide them and you can pretend they don't exist,but they'll still be around.And at last you'll have to deal with them,just like those bananas.

  1. 1.

    The best title for this article is _________.

    1. A.
      Emotions Affect Our Bodies
    2. B.
      What Happens to a Frightened Cat
    3. C.
      What Happens to An Excited Person
    4. D.
      Feelings that People Have
  2. 2.

    The underlined words “churned up” in the fourth paragraph mean _________.

    1. A.
      gradually they'll disappear
    2. B.
      they won't exist any more
    3. C.
      they will hover all over
    4. D.
      your body stays tense
  3. 3.

    The author wrote this article in order to _________.

    1. A.
      tell us that it isn't good to keep feelings inside
    2. B.
      give us some advice on how to express our feelings
    3. C.
      make us face the problem that we have to deal with feelings
    4. D.
      make us know that it isn't always wise to express our feelings freely

Tired of telling students to ask questions and to think about what they were doing, Damien Hynes, a high school geography teacher in Australia, decided to do an experiment to test what he had long been thinking.He wrote some well-organized nonsense (something untrue) on the blackboard.The students simply copied it but very few asked any questions.This shows that students are willing to believe anything given by teachers.The story is repeated in support of the Project for Enhancing Effective Learning (PEEL).
PEEL was carried out by some teachers and researchers in Melbourne who had concluded that normal teaching methods seldom achieve their intended goals; what the teachers think they are teaching is one thing and what the students actually learn is something else.Students’ lack of an over-all view of learning goals and their concentration on test scores make them see each lesson as a separate activity.
Researchers realized that many students do not come into class empty-headed but have their own explanations of how the world works.Their own ideas can remain important to them even when they differ from scientific explanations that are learned later.In fact such ideas are hardly affected by traditional teaching.Students accept the teacher’s scientific explanation, but do not drop their own.They simply keep both and use them practically: in a class test, they copy the teacher’s idea, but in real life they use their own.
Clearly what was needed was to make students understand their learning process(过程), and this is what the PEEL teachers set out to deal with.On the surface,(表面) a class being taught by PEEL methods only differs from an ordinary class in being a little noisier, because more people are talking.But there are some meaningful changes.Students are given much more time to express their views, and teachers don’t make immediate judgment.The students are allowed to guide what is done in class and their own ideas are always respected.This draws their attention to the actual learning process, and they become responsible for their own progress.

  1. 1.

    The aim of Hynes’ experiment was to ______.

    1. A.
      show that students didn’t think about what they learnt
    2. B.
      prove the effectiveness of the project known as PEEL
    3. C.
      test students’ general knowledge about geography
    4. D.
      encourage students to ask more questions in class
  2. 2.

    Why did some teachers and researchers carry out PEEL?

    1. A.
      To ensure teachers do scientific work.
    2. B.
      To help students get higher test scores.
    3. C.
      To find the differences between what is taught and learnt.
    4. D.
      To help normal teaching methods achieve their goals.
  3. 3.

    An important difference between PEEL and non-PEEL classes is that in the PEEL classes ______.

    1. A.
      the teacher does not give the usual scientific explanations
    2. B.
      students always have their own knowledge of the subject
    3. C.
      more attention is paid to the students’ own ideas
    4. D.
      the best explanations are given by the students
  4. 4.

    What is Damien Hynes?

    1. A.
      He is a teacher who teaches geography in a high school in Australia
    2. B.
      He is a geography teacher and a researcher in Australia
    3. C.
      He is a teacher teaching geography in a high school in Austria
    4. D.
      He is a high school geography teacher in Austria.
 0  4705  4713  4719  4723  4729  4731  4735  4741  4743  4749  4755  4759  4761  4765  4771  4773  4779  4783  4785  4789  4791  4795  4797  4799  4800  4801  4803  4804  4805  4807  4809  4813  4815  4819  4821  4825  4831  4833  4839  4843  4845  4849  4855  4861  4863  4869  4873  4875  4881  4885  4891  4899  151629 

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网