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This chemical is made（）a special formula．
A．from
B．of
C．according 120
D．in
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Aging is not a disease, but as a person passes maturity, the cells of the body and the【54】they form. do not function【55】they did in childhood and adolescence. The body provides less【56】against disease mad is more【57】accident.
A number of related causes may【58】aging. Some cells of the body have a fairly long life, but they are not【59】when they, die. As a person ages,【60】of brain cells and muscle cells decreases.【61】body cells die and are replaced by new cells. In an aging person the【62】cells may not be as viable or as【63】growth as those of a young person.
Another【64】in aging may be changes within the cells【65】Some of the protein chemicals in cells are known【66】with age and become less elastic. This is why the skin of old people【67】and hangs loose. This is also the reason old people【68】in height. There may be other more important chemical changes in the cells. Some complex cell chemicals, such as DNA and RNA, store and【69】information that the cells need. Aging may affect this【70】and change the information-carrying molecules so that they do not transmit the information as well.
(51)
A．use to
B．be used to
C．used to
D．had
Not surprising in these hard times, the student's major objective "is to be financially well off. Less important than ever is developing a meaningful philosophy of life. It follows then that today the most popular course is not literature or history but accounting".
Interest in teaching, social service and the "altruistic" fields is at a low. on the other hand, enrollment in business programs, engineering and computer science is way up.
That's no surprise either. A friend of mine (a sales representative for a chemical company) was making twice the salary of her college instructors her first year on the job--even before she completed her two-year associate degree.
While it's true that we all need a career, it is equally tame that our civilization has accumulated an incredible amount of knowledge in fields far removed flora our own and that we are better for ear understanding of these other contributions--be they scientific or artistic. It is equally true that, in studying the diverse wisdom of others, we learn how to think. More important, perhaps, education teaches us to see the connections between things, as well as to see beyond our immediate needs.
Weekly we mad of unions who went on strike for higher wages, only to drive their employer out of business. No company; no job. How shortsighted in the long run !
But the most important argument for a broad education is that in studying the accumulated wisdom of the ages, we improve our moral sense. I saw a cartoon recently which shows a group of businessmen looking puzzled as they sit around a conference table; one of them is talking on the intercom (对讲机): "Miss Baxter," he says, "could you please send in someone who can distinguish fight from wrong？"
From the long-term point of view, that's what education really ought to be about.
According to the author's observation, college students ______ .
A．have never been so materialistic as today
B．have never been so interested in the arts
C．have never been so financially well off as today
D．have never attached so much importance to mural sense
New "fake fat" products appeared on stone 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 fat from certain foods. 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 chemical 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 fatty 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 carded 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 broken down. Manufacturers say it's that ability to slide unchanged through the intestines that makes olestra so valuable as a fat substitute. It provides consumers with the taste of regular fat 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 mad 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
There is less risk of mad cow disease in young cows.
A．Y
B．N
C．NG
The husband has almost been driven mad by his wife's (end) ______ complaints.
The mad man was put in the soft-padded cell lest he ______ himself.
A．injure
B．had injured
C．injured
D．would injure
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