How can you find out what is going on inside a person’s body without opening the

Howcan you find out what is going on inside a person’sbody without opening the patient’s body up? Regular X rays canshow a lot. CAT scans can show even more. They can give a complete view of bodyorgans.

Whatis a CAT scan? CAT stands for a kind of machine. It is a special X-ray machinethat gets a 360-degree picture of a small area of a patient’s body.

Doctorsuse X rays to study and determine diseases and injuries within the body, X rayscan find a foreign object inside the body or take pictures of someinside organs to be X-rayed.

ACAT 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 finegroup of X rays is scanned across the body and around the patient from manydifferent directions. A computer studies the information from each directionand produces a clear cross-sectional picture on a screen. This picture is thenphotographed 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 giveclear pictures of active, moving organs, just as a fast-action camera can “stop the action”, giving clear pictures of whatappears unclear to the eye. And because of the 360-degree pictures, CAT scansshow clear and complete views of organs in a manner that was once only shownduring operation or examination of a dead patient.

Frequentappearance before X rays can cause skin burns, cancer or other damage to thebody. Yet CAT scans actually don’t cause the patient to moreradiation than regular X rays do. CAT scans can also be done without gettingsomething harmful into the patient, so they are less risky than regular X rays.

CATscans provide exact, detailed information. They can quickly find such a thingas bleeding inside the brain. They are helping to save lives.

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.

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

3.What is the special use of thelatest CAT scanners?

A．It provides clear photos of moving organs.

B．It can take 3-dimension（三维）picturesof 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.

4.We can infer from this passagethat      .

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 partof it

5.The best title of this passagemight 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

试题答案

【答案】

1.C

2.D

3.A

4.A

5.B

【解析】略