When fatty acids undergo β-oxidation in liver,which compound will not be produced？

A.polyunsaturated fat

B.monounsaturated fat

C.saturated fat

D.short-chain fatty acids

A.decarboxylation 脱发

B.oxygenation 氧合

C.hydrogenation 氢化

D.hydrolysis水解

A.polyunsaturated fat

B.monounsaturated fat

C.saturated fat

D.short-chain fatty acids

A.contains plenty of nutrients

B.renders foods calorie -free while retaining their vitamins

C.makes foods easily digestible

D.makes foods fat -free while keeping them delicious

New "fake fat" products appeared on store shelves in the United States recently, but not everyone is happy about it. Makers of the products, which contain a compound called olestra, say food manufacturers can now eliminate. Critics, however, say the new compound can rob the body of essential vitamins and nutrients (营养物) and can also cause unpleasant side effects in some people. So it's up to consumers to decide whether the new fat-free products taste good enough to keep eating.

Chemists discovered olestra in the late 1960s, when they were searching for a fat that could be digested by infants more easily. Instead of finding the desired fat, the researchers created a fat that can't be digested at all.

Normally, special chemicals in the intestines(肠)"grab" molecules of regular fat and break them down so they can be used by the body. A molecule of regular fat is made up of three molecules of substances called fatting acids.

The fatty acids are absorbed by the intestines and bring with them the essential vitamins A, D, E and K. When fat molecules are present in the intestines with any of those vitamins, the vitamins attach to the molecules and are carried into the bloodstream.

Olestra, which is made from six to eight molecules of fatty acids, is too large for the intestines to absorb. It just slides through the intestines without being broke down. Manufacturers say it's the ability to slide unchanged through the intestines that makes olestra so valuable as a fat substitute. It provides consumers with the taste of regular at without any bad effects on the body. But critics say olestra can prevent vitamins A, D, E and K from being absorbed. It can also prevent the absorption of carotenoids(类胡萝卜素), compounds that may reduce the risk of cancer, heart disease, etc.

Manufacturers are adding vitamins A, D, E and K as well as carotenoids to their products now. even so, some nutritionists are still concerned that people might eat unlimited amounts of food made with the fat substitute without worrying about how many calories they are consuming.

We learn from the passage that olestra is a substance that______.

A．contains plenty of nutrients

B．renders foods calorie-free while retaining their vitamins

C．makes foods easily digestible

D．makes foods fat-free while keeping them delicious

A．It helps protect some necessary fatty acids for healthy cells

B．Vitamin E only helps control infections from listeria

C．Vitamin E helps the poultry develop more infectionfighting cells

D．Extra amounts of vitamin E can improve the quality of meat

A.Is this senous？

B.Anything else I should do？

C.I feel better no

D.It hurts when you press

Brooke Walker keeps eating junk food(垃圾食品)and already weighs more than Britain's fattest teenager did at the same age .she's been warned by the doctor that they can do no more for her .Next month ,she will begin a healthy eating and exercise plan to save her life.

Brook, who’s too large for girls’ clothes and has to wear boys’ clothes, has been laughed at all her life. She stays indoors much of the time. ”when ”I look in the mirror I feel sad,” she said.

“Doctors have told me that unless I lose weight and exercise I will be very, very sick when I grow up. I have tired really hard to do as the doctors say. But every time I play outside, people stop and look at me and call me “fatso”. I end up crying in my room. ”

Brooke’s weight increased quickly when she developed a love of takeaways and fatty junk food. She often ordered food from shops or restaurant and ate at home. Her daily meal used to be potato chips, chocolates, pizza, and sweet drinks. Brooks’ mum Stacey, a busy single mum, admits Brooke suffered from being dished up with fast food in her early year.

In the first seven days she won’t be able to phone home, but she’s determined to succeed. “I can’t wait to go,” she says. “I am not afraid of going away. My one wish is to lose weight and look like other girls. I am tired of being called fatty and want it to end.”

32、what does the underlined word “diet” most probably mean in the text？()

A.To limit(限制) food

B.To do exercise

C.To see a doctor

D.To go outdoors

33、How does Brooke feel about being fat？()

A.calm

B.sad

C.angry

D.nervous

34、What has caused Brooke’s health problem？()

A.Poor family background

B.bad eating habit

C.lack of exercise equipment

D.little food at home

Americans this year will swallow 15,000 tons of aspirin, one of the safest and most effective drugs invented by man. The most popular medicine in the world today, it is an effective pain reliever. Its bad effects are relatively mild, and it is cheap.

For millions of people suffering from arthritis(关节炎), it is the only thing that works. Aspirin, in short, is truly the 20th century wonder drug. It is also the second largest suicide drag and is the leading cause of poisoning among children, it has side effects that, although relatively mild, are largely unrecognized among uses.

Although aspirin was first sold by a German company in 1899, it has been around much longer than that. Hippocrates, in ancient Greece, understood the medical value of the leaves and tree bark which today are known to contain salicylates(水杨酸盐), the chemical in aspirin. During the 19th century, there was a great deal of experimentation in Europe with this chemical, and it led to the introduction in Europe with this chemical, and it led to the introduction of aspirin. By 1915, aspirin tablets were available in the United States.

A small quantity of aspirin(two five-grain tablets) relieves pain and inflammation(炎症). It also reduces fever by interfering with some of the body's reactions. Specifically, aspirin seems to slow down the formation of the acids involved in pain and the complex chemical reactions that cause fever. The chemistry of these acids is not fully understood, but the slowing effect of aspirin is well known.

Aspirin is very irritating to the stomach, and many aspirin takers complain about upset stomach. There is a right way and a wrong way to take aspirin. The best way is to chew the tablets before swallowing them with water, but few people can stand the bitter taste. Some people suggest crushing the tablets in milk or orange juice and drinking that.

A good title for this article would be______.

A．Why I Take Aspirin

B．The Side Effects of Aspirin

C．Aspirin: The Most Popular Medicine in the World

D．Aspirin, a Good Medicine