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

Which of the following statements is true

A．Diseases caused by bacteria and viruses were incurable in 1900.
B．Bacteria and viruses are the main causes of death today.
C．Medicines for curing pneumonia were not available in 1900.
D．Pneumonia caused as many deaths in 1900 as cancer does today.

单项选择题

According to the author competition differs from conflict in that______.

A．it results in war in most eases
B．it induces efforts to expand territory
C．it is a kind of opposition among social entities
D．it is essentially a struggle for existence