閱讀理解。

     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 (energy).
     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 (unit
for measuring the energy value of food) 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 (蛋白質(zhì)) 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 (something that is difficult to understand or to explain) 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. 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
3. 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
4. What is probably the best title for the article?
A. Two Great Experiments
B. The Mystery of Human Life
C. Ways to lengthen Human Life
D. The Breakthrough in the Study of Aging
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    A
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    科目:高中英語 來源:江西省臨川一中2010屆高三下學期4月月考 題型:閱讀理解


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    A
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    A
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    A
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    .

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    閱讀下列短文,從每題所給的四個選項(A. B.C和D)中,選出最佳選項,并在答題卡上將該項涂黑。

    I used to work in an office, which had a Iocust tree growing outside the window. It had grown into a tall tree and must have been there for a long time. The tree blocked the view and made the office seem dull. Unfortunately, this happened to be the room assigned(分配)to me, and l was depressed by it for quite some time.

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    56. The Jocust tree first attracted the author most by____.

    A. the way it blocked the view    B.its height

    C. the smell ofits flowers    D.its green leaves

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    A. Spring.    B.Summer    C.Autumn.    D.Winter.

    58. Which ofthe following statements is true of the author according to the passage?

    A. He would have regretted ifthe locust tree had died as he had thought it had.

    B. The locust tree turned out to be a lovely memory for him.

    C. He felt unhappy as he had forgotten to take the photos with him.

    D. Hls work in the office changed with the seasons every year.

    59. It can be inferred from the passage that _

    A. the locust tree died soon after the author left the office

    B. the author worked in the office for at least a few years

    C. it was summer when the author took his job in the office

    D. the wPather was dry when the author first saw the tree

    60. What advice does the author intend to give us?

    A. Treasure what we've owned.                B. Look before you leap.

    C. Treat everything calmly.                  D. Never forget the past.

     

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