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.

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 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.

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

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

 

“In only six days I lost seven pounds of weight.”

“Two full inches in the first three days!”

These are the kinds of statements used in magazine，newspaper, radio and television ads, promising new shapes and new looks to those who buy the medicine or the device. The promoters of products say they can shape the legs, slim the face, smooth wrinkles, or in some other way to add to beauty or desirability.

Often such products are nothing more than money-making things for their promoters. The results they produce are questionable, and some are dangerous to health.

To understand how these products can be legally promoted to the public, it is necessary to understand something of the laws covering their regulation. If the product is a drug, FDA(Food and Drug Administration)can require proof under the Food, Drug, and Cosmetic Act that is safe and effective before it is put on the market. But if the product is a device, FDA has no authority to require premarketing proof of safety or effectiveness. If a product already on the market is a danger to health, FDA can request the producer or distributor to remove it from the market voluntarily, or it can take legal action, including seizure(查封)of the product.

One notable case a few years ago involved an electrical device called the Relaxacisor, which had been sold for reducing the waistline. The Relaxacisor produced electrical shocks to the body through contact pads. FDA took legal action against the distributor to stop the sale of the device on the grounds that it was dangerous to health and life.

Obviously, most of the devices on the market have never been the subject of court proceedings(法律诉讼)，and new devices appear continually. Before buying, it is up to the consumer to judge the safety or effectiveness of such items.

1.It can be inferred that the ads mentioned in the text are            .        .

A．objective

B．costly

C．unreliable

D．illegal

2.Which of the following is TRUE according to the text?

A. The court is in charge of removing dangerous products.

B. New products are more likely to be questionable.

C. The production of a device must be approved by FDA.

D. The promoters usually just care about profits.

3.FDA can ask for the proof of safety and effectiveness of a product             

A．if it is a drug

B．if it is a device

C．if its consumers make complaints

D．if its distributors challenge FDA’s authority

4.The Relaxacisor is mentioned as                   .

A．a product which was designed to produce electricity

B．a product whose distributor was involved in a legal case

C．a successful advertisement of a beauty product

D．an example of a quality beauty product

5.The author intends to            

A．make consumers aware of the promoters’ false promises

B．show the weakness of the law on product safety

C．give advice on how to keep young and beautiful

D．introduce the organization of FDA

 

 A lot of people ______ the theory that acupuncture can produce chemicals in the body which reduce pain.

A．correspond to                          B．relate to

C．subscribe to                           D．refer to

 

It takes more than just practice to become an Olympian. Gold medal performances require some serious nutrition. Have you ever wondered what these successful athletes eat to stay in peak shape?

Keri Glassman, a registered dietitian and founder of Nutritious Life Meals, appeared on “Good Morning America” today to give you a glimpse into the diets of some top athletes. Some of their meals could surprise you.

Crazy Calorie Count

Glassman said Olympians eat a lot of food- quantities that for ordinary people would constitute pigging out. One secret of swimmer Michael Phelps’ astonishing performance in the 2008 Olympics in Beijing was consuming as many as 12,00 calories in one day.

Athletes can eat like this and not gain any weight because their workouts are intense. According to Glassman, Phelps’ workouts can burn 4,000 to 6,000 calories in a day, and those calories must be added in order to train the following day.

Snacking Secrets

Some athletes eat strange foods that improve their performance. Yohan Blake, the Jamaica sprinter and 100-meter world champion, has stolen champion sprinter Usain Bolt’s thunder on the track during the Olympic trials. Asked about how he gets his energy, Blake answered that he eats 16 bananas per day ,Glassman said.

Jonathan Horton, the lead gymnast on the Us team, has a blood sugar problem. His solution is honey. When he starts to feel shaky at the gym, he takes honey to boost his energy, Classman said.

Foods for Recovery

What are the best foods to help the body recover after harsh competition?

For Olympic swimmer Ryan Lochte, the recovery meal is grilled chicken breasts with Alfredo sauce, whole-grain spaghetti and a salad with lemon juice and olive oil. Lochte, who recently cut out junk food, candy and soda, has undertaken a strength-training regimen(养生法)that involves flipping tractor tires, and tossing beer kegs, Glassman said.

1.What’s the best title of this passage?

A．Good Diet Makes a True Olympian.

B．Olympians Have Olympic-size Appetites.

C．The Diet of Some Top Olympic Athletes.

D．Olympians’ Strange Eating Habits.

2.What does the underlined sentence probably mean?

A．Ordinary people eat few pigs compared with Olympians.

B．Olympians eat a lot more food than ordinary people.

C．Olympians tend to eat a lot of high-quality food.

D．Olympians eat a large amount of food, just like pigs.

3.Which of the following is TRUE according to the passage?

A．Ryan Lochte quit eating junk food , candy and soda for his better recovery.

B．Yohan Blake finally beat Usain Bolt in the 100-meter track in the Olympics.

C．Michael Phelps’ astonishing performance was due to his eating lots of food.

D．Jonathan Horton has a blood sugar problem because of taking too much honey.

4.The passage is most likely to be found in     .

A．a technical report                       B．a fashion magazine

C．an education column                     D．a sports newspaper

 

Like distance runners on a measured course，all of us will move through time in a roughly predictable pattern．

In the first stage of our lives，we develop and grow, reaching toward the top of physical vitality(活力)．

After we grow up，however, the body begins a process of gradually wearing out．

A new awareness of physical fitness may help lengthen our years of health and vitality，yet nothing we do will work to stop the unavoidable force of aging．

Most of the changes of aging take place deep inside the body．The lungs become less able to take in oxygen．Powerful muscles gradually lose their strength．The heart loses power and pumps less blood．Bones grow easier to break．

Finally, we meet a stress，a stress that is greater than our physical resistance．Often，it is only a minor accident or chance infection(a disease caused by virus)，but this time，it brings life to an end．

In 1932，a classic experiment nearly doubled the lifetime of rats，simply by cutting back the calories in their diet The reason for the effect was then unknown．

Today, at the University of California at Berkley, Dr．Paul Seagle has also greatly lengthened the normal lifetime of rats．The result was achieved through a special protein limited diet，which had a great effect on the chemistry of the brain．Seagle showed that within the brain，specific chemicals control many of the signals that influence aging．By changing that chemical balance，the clock of aging can be reset．

For the first time, the mystery of why we age is being seriously challenged．Scientists in many fields are now making striking and far-reaching discoveries．

An average lifetime lasts 75 years，yet in each of us lies a potential for a longer life．If we could keep the vitality and resistance to disease that we have at age twenty, we would live for 800 years．

1.What does the underlined word “it” refer to?

A．Physical vitality．

B．Stress．

C．Aging．

D．Physical resistance．

2.Which of the following is not a change of aging?

A．People gradually lose their muscle strength．

B．Bones tend to break more easily．

C．The heart loses power and pumps less blood．

D．The lungs become unable to take in oxygen．

3.The author believes the following except that     ．

A．human's life pattern is predictable

B．physical fitness can't stop the force of aging

C．human's lifetime will last longer than 75 years

D．all of the changes of aging take place deep inside the body

4.How did Dr．Paul Seagle lengthen the lifetime of rats in his experiment?

A．By keeping their physical fitness．	B．By cutting the calories in their diet．
C．By resetting their clock of aging．	D．By limiting the protein in their diet．

5.What is probably the best title for the article?

A．Two Great Experiments

B．The Mystery of Human Life

C．The Breakthrough in the Study of Aging

D．Ways to lengthen Human Life