请教两道逻辑题。。。菜鸟一只，刚开始准备G不到一周

雪梦儿

都是大红色那本厚厚书里面的。。。
"Life expectancy" is the average age at the death of the entire live-born population. In the middle of 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 gage 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 popultion 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 so do only because of medical technology taht 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.


Cable-television spokesperson: Subscriptions to cable television are a bargain in comparison to "free"  television. Remember that "free" television is not really free. It is consumers, in the end, who pay for the costly advertising that supports"free" television.
Which of the following, if ture, is most damaging to the position of the cable-television spokesperson?
A.Consumers who do not won television sets are less likely to be influenced in the their purchasing decisions by television advertising than are consumers who own television sets.
B.Subscriptions to cable television include access to some public-television channels, which do not accept advertising.
C.For locations with poor television reception, cable television provides picture quality superior to that provided by free television.
D.There is as much advertising on many cable-television channels as there is on "free" television channels.
E.Cable-television subscribers can choose which channels they wish to receive.


答案。。。估计不用给出来了。。。希望大家帮我解释下，我看了解释都看不懂啊。。。

moremildseven

the first one B
if the number of infants who die in their first year of life is calculated in the Life expectancy, life expectancy in the last 150 years was certain low.However, if today's life expectancy gains because the factor above diminishes, that is, 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. therefore, we can not conclude that people must have been considered old at an gage that we now consider the prime of life.

the second one D
if there is as much advertising on many cable-television channels as there is on "free" television channels, it was not a bargain to subcribe the cable television.becanse the cable television and the free television are same

mablic

金山快译啊。。。

雪梦儿

谢谢。。。但是第二题还是不太懂。。。。

tyzgmat

看不懂 有啥用啊 大哥
难道考试也有人帮你翻译？
踏踏实实背单词啦  实事求是啊   木有学过毛邓三？