单项选择题

According to recent studies ______.

A．rats like to live in overcrowded conditions
B．men's behaviour and health are not related with the living space
C．living conditions affect rat's behaviour and health
D．None of the above

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单项选择题

The writer also discloses that ______.

A．the larger population, the more violence
B．population has nothing to do with violence
C．violence determines population
D．population determines violence

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.