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 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.
【参考答案】1—4、BDAD
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