单项选择题

The less crowded the space is, ______.

A．the more rats like to sleep and eat
B．the less rats want to live with others
C．the more rats try to kill each other
D．the less likely rats bite and kill each other

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单项选择题

The best title of the passage might be ______.

A．Social Security Benefits in the United States
B．Aging Process Controlled
C．Ideal Living Conditions
D．Man's Possible Life Span

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.