How can you find out what is going on inside a person’s body without opening the patient’s body up? Regular X rays can show a lot. CAT scans can show even more. They can give a complete view of body organs.
What is a CAT scan? CAT stands for a kind of machine. 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 determine diseases and injuries within the body, X rays can find a foreign object inside the body or take pictures of some inside organs to be X-rayed.
A CAT scanner, however, uses a group of X rays to give a cross-sectional(横截面)view of a specific part of the body. A fine group of X rays is scanned across the body and around the patient from many different directions. A computer studies the information from each direction and produces a clear cross-sectional picture on a screen. This picture is then photographed for later use. Several cross sections, taken one after another, can give clear “photos” of the entire body or of any body organs. The latest CAT scanners can even give clear pictures of active, moving organs, just as a fast-action camera can “stop the action”, giving clear pictures of what appears unclear to the eye. And because of the 360-degree pictures, CAT scans show clear and complete views of organs in a manner that was once only shown during operation or examination of a dead patient.
Frequent appearance before X rays can cause skin burns, cancer or other damage to the body. Yet CAT scans actually don’t cause the patient to more radiation than regular X rays do. CAT scans can also be done without getting something harmful into the patient, so they are less risky than regular X rays.
CAT scans provide exact, detailed information. They can quickly find such a thing as bleeding inside the brain. They are helping to save lives.
【小题1】What is NOT true of a CAT scan?

A.It is safer than regular X rays.
B.It makes use of computer techniques.
C.It can stop the action of an organ for a short time.
D.It gives clear pictures of active, moving body parts.
【小题2】The underlined words “a foreign object”(Para 3)most probably refer to     .
A.a badly injured part inside the body
B.a new thing that is unknown to the doctor
C.a strange organ that has grown in the body
D.an object that gets inside the body by chance
【小题3】What is the special use of the latest CAT scanners?
A.It provides clear photos of moving organs.
B.It can take 3-dimension(三维)pictures of inside organs.
C.It won’t cause serious skin burns, cancer or other damage to the body.
D.It helps to find out what is going on inside a person’s body without opening it up.
【小题4】We can infer from this passage that     .
A.patients in front of CAT may suffer from a bit of radiation
B.doctors need no opening-up of the body with CAT scanners
C.CAT scanners are more expensive than regular X-ray machines
D.CAT scanners can take photos of either the whole body or a part of it
【小题5】The best title of this passage might be        .
A.the Newest Medical Invention
B.New X-ray Machine to Save Lives
C.How to Avoid the Damage of X Rays
D.Advantages and Disadvantages of CAT Scanners

  As we know, Human beings each have unique brains. The brain is of the greatest importance to the body. It is the boss of the body.Your eyes,ears,nose,and skin tell your brain what is going on around you.Other parts of your body tell your brain what is going on inside of you.Your brain takes in the signals.It tells your body what to do with them.When you touch fire,your skin tells your brain that your finger is too hot.Your brain tells you to move your finger.All these happen very fast.Your brain also controls your breathing,blinking,and heartbeat.It controls your feelings and thoughts too.
  Humans have the most developed brain of all animals.Yet it is not the largest brain.The human brain weighs three pounds.The brain of an elephant weighs 11 pounds.So the largest brain is not always the best brain.In people,a larger brain does not mean a clever person.
【小题1】What is the main idea of this passage?
  

A.The human brain works very fast.
B.The largest brain is not always the best brain.
C.The brain controls the body.
D.The best brain is the largest brain.
【小题2】What happens after the brain takes in the signals from the body?
A.The brain grows faster and larger.B.The brain tells the body what to do.
C.The body becomes more developed.D.We don't know.
【小题3】What does “the boss of the body” mean?
A.The signals.B.The most developed body part.
C.The main part of the body.D.The centre of the body.
【小题4】Which brain is the most developed?
A.The largest brain.B.The human brain.
C.The smaller brain.D.Not too big brain.
【小题5】What are the things that the human brain does?
  A.Takes in signals.       B.Controls breathing.
  C.Controls feelings and thoughts. D.A,B and C.

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