标题: OG 12 第一题 [打印本页] 作者: DayDreamings 时间: 2010-8-15 08:16 标题: OG 12 第一题
“Life expectancy” is the average age at death of the
entire live-born population. In the middle of the
nineteenth century, life expectancy in North America
was 40 years, whereas now it is nearly 80 years.
Thus, in those days, people must have been
considered old at an age that we now consider the
prime of life.
Which of the following, if true, undermines the
argument above?
(A) In the middle of the nineteenth century, the
population of North America was significantly
smaller than it is today.
(B) Most of the gains in life expectancy in the last
150 years have come from reductions in the
number of infants who die in their first year
of life.
(C) Many of the people who live to an advanced age
today do so only because of medical technology
that was unknown in the nineteenth century.
(D) The proportion of people who die in their
seventies is significantly smaller today than is the
proportion of people who die in their eighties.
(E) More people in the middle of the nineteenth
century engaged regularly in vigorous physical
activity than do so today.
不太明白为什么D选项是support the argument????作者: painsper 时间: 2010-8-15 20:39
