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  3. Doctors are of the opinion that most people cannot live beyond 100 years, but a growing number of scientists believe that the ag

Doctors are of the opinion that most people cannot live beyond 100 years, but a growing number of scientists believe that the ag

admin2009-05-15  55
问题     Doctors are of the opinion that most people cannot live beyond 100 years, but a growing number of scientists believe that the aging (衰老) process can be controlled. There are more than 12,000 Americans over 100 years old who receive Social Security (社会保险) benefits, and their numbers are increasing each year. Dr. James Langley of Chicago claims that, theoretically and under ideal conditions, animals, including man, can live six times longer than their normal period of growth. A person’s period of growth lasts approximately twenty-five years. If Dr. Langley’s theory is accurate, future generations can expect a life span(寿命) of 150 years.
选项 A、Within a few generations, most people may live much longer than they do now.
B、More than 12,000 Americans are over 100 years old.
C、Doctors and scientists disagree over the question of man’s possible life span.
D、Man’s normal period of growth is approximately as long as that of animals.
答案A
解析
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