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    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,生气).
    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.
    小题1: What does the underlined word “it” refer to?
    A．Physical vitality.B．Stress. C．Aging.D．Physical resistance.
    小题2:Which of the following is not a change of aging?
    A．The lungs become unable to take in oxygen.
    B．People gradually lose their muscle strength.
    C．The heart loses power and pumps less blood.
    D．Bones tend to break more easily.
    小题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
    小题4:How did Dr. Paul Seagle lengthen the lifetime of rats in his experiment?
    A．By limiting the protein in their diet.B．By cutting the calories in their diet.
    C．By resetting their clock of aging.D．By keeping their physical fitness.
    小题5: What is probably the best title for the article?
    A．Two Great ExperimentsB．The Mystery of Human Life
    C．Ways to lengthen Human LifeD．The Breakthrough in the Study of Aging

    小题1:B           
    小题1:A
    小题1:D
    小题1:A
    小题1:D
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    In 1963,former Senator Gaylord Nelson began to worry about our planet (A senator is a person that the people of the United States have chosen to help make the laws.). Senator Nelson knew that our world was getting dirty and that many of our plants and animals were dying .He wondered why most people weren’t trying to solve these problems. He talked to other lawmakers and to the President. They decided that the President would go around the country and tell people about these concerns（关系重大之事）. He did, but still not enough people were working on the problem.
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    B．Many plants and animals were dying.
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    D．All of the above.
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    Scientists are closely concerned with the structure of buildings and with the quality of building materials． The World health Organization （WHO) observes that the introduction of air conditioning and energy conservation （保护) measures have been accompanied by growing problems of indoor air quality． Some pollutants arise from insulation （隔音) products, some from moving cars, and others from modern housing materials． As many Europeans spend up to 90% of their lives in buildings, the health effects of the indoor climate are very important．
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    A．Some building materials pollute indoor air．
    B．Some factors cause indoor air pollution．
    C．Asbestos can cause lung cancer．
    D．The land on which houses are built contributes to indoor pollution．
    小题2:Why are Europeans particularly concerned with building materials?
    A．Lots of building materials there are radioactive．
    B．They stay home up to 90% of their lives．
    C．They have a high rate of lung cancer．
    D．They spend most of their time indoors．
    小题3:Why is asbestos a sought-after building material?
    A．It is a kind of insulation foam．
    B．Asbestos will not give out dangerous gas．
    C．This material is not easy to catch fire．
    D．It is rarely present in rock formations．
    小题4:Why should we be careful about the land on which a building is to be sited?
    A．To determine whether the land is firm enough for a building to be sited on．
    B．To make sure that the land contains no radioactive material．
    C．To make certain that the land releases no formaldehyde or other gases．
    D．To check whether it contains any combustible materials．

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