阅读理解Howcanyoufindoutwhatisgoing

阅读理解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 plete 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 puter 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 plete 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 lives1.What is NOT true of a CAT scan?A.It is safer than regular X raysB.It makes use of puter techniquesC.It can stop the action of an organ for a short timeD.It gives clear pictures of active, moving body parts2.The underlined words “a foreign object”（Para 3）most probably refer toA.a badly injured part inside the bodyB.a new thing that is unknown to the doctorC.a strange organ that has grown in the bodyD.an object that gets inside the body by chance3.What is the special use of the latest CAT scanners?A.It provides clear photos of moving organsB.It can take 3-dimension（三维）pictures of inside organsC.It won’t cause serious skin burns, cancer or other damage to the bodyD.It helps to find out what is going on inside a person’s body without opening it up4.We can infer from this passage thatA.patients in front of CAT may suffer from a bit of radiationB.doctors need no opening-up of the body with CAT scannersC.CAT scanners are more expensive than regular X-ray machinesD.CAT scanners can take photos of either the whole body or a part of it5.The best title of this passage might beA.the Newest Medical InventionB.New X-ray Machine to Save LivesC.How to Avoid the Damage of X RaysD.Advantages and Disadvantages of CAT Scanners