单项选择题

People have done much study on the family because______.

A．it is composed of people themselves
B．it is one of the social institutions
C．it is something hard to understand
D．it involves many different social customs

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单项选择题

What does the sentence It is man alone who lives in a society (Lines 4-5, Para. 1) mean in the passage

A．There is only one man among those living in a society.
B．Living in a society are only human beings and without any animals.
C．Only that which is organized by human beings can be considered as society.
D．All people living in as society are isolated from each other.

单项选择题

Which of the following is closest in meaning to eligibility criteria ( Line 5, Para. 4)

A．Qualifications.
B．Specifications.
C．Edibility.
D．Reliability