单项选择题

On an average, people in America who were born in 1900 ______.

A．had a life-span of 74 years
B．lived a shorter but better life than those born later
C．lived to 47 years of age
D．lived 27 years longer than those born in 1981

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热门试题

单项选择题

In the first paragraph, the author gives the definitions of some terms in order to ______.

A．argue for the similarities between animal societies and human societies
B．smooth out the conflicts in human societies
C．distinguish between two kinds of opposition
D．summarize the characteristic features of opposition and cooperation

单项选择题

The passage is probably intended to answer the question ______ .

A．Is war inevitable
B．Why is there conflict and competition
C．Is conflict desirable
D．Can competition lead to conflict