单项选择题

Which of the following statements is TRUE according to the passage

A．If a man receives Social Security benefits, he can live longer than 100 years.
B．If someone lives over 100 years, he can still receive Social Security benefits.
C．It takes a person 20 years to become full grown.
D．Living with an animal is the ideal condition for having a long life.

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单项选择题

The underlined part of the first sentence Doctors are of the opinion that' means ______.

A．"Doctors are against that '""
B．"Doctors declare that "'"
C．"Doctors think that'""
D．"Doctors find that'""

单项选择题

Which of the following statements best expresses the main idea of the passage

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.