题目内容
After we talked about it for a long time, he agreed to help us ______.
- A.at an end
- B.in the end
- C.as usual
- D.at present
试题分析：短语辨析。A结束；B最后，终于；C和平时一样；D目前；现在；句意：在未命名谈论了很长一段时间以后，他终于同意帮助我们了。根据句意说明B正确。
考点：考查短语辨析
点评：短语词义的辨析要放在上下文中进行，要根据句意和语境辨析。
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?
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A．Physical vitality． |
B．Stress． |
C．Aging． |
D．Physical resistance． |
2.Which of the following is not a change of aging?
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A．People gradually lose their muscle strength． |
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B．Bones tend to break more easily． |
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C．The heart loses power and pumps less blood． |
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D．The lungs become unable to take in oxygen． |
3.The author believes the following except that ．
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A．human's life pattern is predictable |
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B．physical fitness can't stop the force of aging |
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C．human's lifetime will last longer than 75 years |
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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?
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A．By keeping their physical fitness． |
B．By cutting the calories in their diet． |
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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?
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A．Two Great Experiments |
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B．The Mystery of Human Life |
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C．The Breakthrough in the Study of Aging |
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D．Ways to lengthen Human Life |
阅读下面短文，从短文后所给各题的四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
When I was in the 8th grade in Ohio, a girl named Helen in my class had a terrible accident. As she was 31 to the bus in order not to miss it, she slipped on the ice and fell under the back wheels of the bus. She 32 the accident but was paralyzed from the waist down. I went to see her, in my 13-year-old 33 thinking that she wouldn’t live 34 from then on.
Over the years, I 35 and didn’t think much about Helen after that. Three years ago ,in Florida, my oldest son was hit by a car while riding his bike, 36 a terrible brain injury. While I was looking after my son, a lady who said she was the hospital’s social worker called. It was a(an) 37 trying(难受的)day. I burst into tears for no reason and rang 38 .
A short time later, a beautiful woman, in a wheelchair, 39 into my son’s room with a box of 40 .After 16 years, I still 41 Helen. She smiled, handed me the tissues and hugged me. I told her who I was, and after we both went through the shock of that, she began to tell me about 42 since we last saw each other. She married, had children and got her degree so that she 43 the path for those people who were less 44 than her. She told me that if there was anything she could give me, it would be 45 .
Looking at this wonderful, giving person, I felt 46 .But I also felt the first hope I had since learning that my son was 47 .From this person that I thought would have no 48 of life, I learned that where there is life, there is hope. My son miraculously(神奇的) 49 and we moved north, but I owe Helen 50 that I can never repay.
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7.A normally |
B．particularly |
C．necessarily |
D．eventually |
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