Finding of a survey of
Systems magazine subscribers: Thirty percent of all merchandise
orders placed by subscribers in response to advertisements in the
magazine last year were placed by subscribers under age thirty-five.
Finding of a survey of
advertisers in Systems magazine: Most of the merchandise orders
placed in response to advertisements in Systems last year were placed
by people under age thirty-five.
For both of the findings
to be accurate, which of the following must be true?
(A) More subscribers to
Systems who have never ordered merchandise in response to
advertisements in the magazine are age thirty-five or over than are
under age thirty-five.
(B) Among subscribers to
Systems, the proportion who are under age thirty-five was
considerably lower last year than it is now.
(C) Most merchandise
orders placed in response to advertisements in Systems last year were
placed by Systems subscribers over age thirty-five.
(D) Last year, the average
dollar amount of merchandise orders placed was less for subscribers
under age thirty-five than for those age thirty-five or over.
(E) Last year many people
who placed orders for merchandise in response to advertisements in
Systems were not subscribers to the magazine.
为什么正确答案是E， 这个题目没有看的太明白。
Astronomer: Observations
of the Shoemaker-Levi comet on its collision course with Jupiter
showed that the comet broke into fragments before entering Jupiter's
atmosphere in 1994, but they did not show how big those fragments
were. In hopes of gaining some indication of the fragments' size,
astronomers studied spectrographic analyses of Jupiter's outer
atmosphere. These analyses revealed unprecedented traces of sulfur
after the fragments' entry. The fragments
themselves almost certainly contained no sulfur, but many astronomers
believe that the cloud layer below Jupiter's outer atmosphere does
contain sulfur. Since sulfur would have
seeped into the outer atmosphere if comet fragments had penetrated
this cloud layer, it is likely that some of
the fragments were at least large enough to have passed through
Jupiter's outer atmosphere without being burned up.
In the astronomer's
argument, the two portions in boldface
play which of the following roles?
(A) The first presents a
circumstance for which the astronomer offers an explanation; the
second is part of that explanation.
(B) The first acknowledges
a consideration that weighs against the conclusion of the argument;
the second is that conclusion.
(C) The first acknowledges
a consideration that weighs against the conclusion of the argument;
the second provides evidence in support of that conclusion.
(D) The first provides
evidence in support of the conclusion of the argument; the second
acknowledges a consideration that weighs against that conclusion.
(E) The first is a
judgment advanced in support of the conclusion of the argument; the
second is that conclusion.
我对这类型的题目，好像错误率非常之高。不知道同学们有什么好的方法或者讲究可以给我推荐一下么？
PREP-1-28
First-time computer buyers
buying PXC home computers typically buy models that cost much less
and have a smaller profit margin per computer than do PXC computers
bought by people replacing their computers with more powerful models.
Last year PXC's profits from computer sales were substantially
higher than the previous year, although about the same number of PXC
computers were sold and the prices and profit margins for each
computer model that PXC sells remained unchanged.
If the statements above
are true, which of the following is most strongly supported by them?
(A) PXC's competitors
raised the prices on their computers last year, making PXC computers
more attractive to first-time computer buyers.
(B) The number of people
buying PXC computers who also bought PXC computer-related products,
such as printers, was larger last year than the previous year.
(C) Among computer buyers
who bought a PXC computer to replace their existing computer, the
proportion who were replacing a computer made by a competitor of PXC
was greater last year than the previous year.
(D) The proportion of PXC
computers bought by first-time computer buyers was smaller last year
than the previous year.
(E) PXC's production costs
for its computers were lower last year than they had been the
我选择的答案是E，刚开始的时候再选项D、E之间徘徊了，选择了E。按照我的理解，D比较紧扣题意。但是E选项有什么明显的不对之处么？
谢谢同学们的帮助。：）
不好意思，复制的时候总是会出现像上面内容当中的乱码。希望不会有太的影响.
第一题很简单，题干就两句话
第一句《X》订阅者调研发现：受广告影响订阅者中，有30%年龄小于35
第二句《X》广告主调研发现：大多数受《X》中广告影响的人，年龄小于35
A 没订《x》中，35岁以上较多
B 订《X》的人，去年比今年少
C 大多数受《X》中广告影响的人是《X》35岁以上的订阅者
D 35岁以下掏钱比35岁掏得少
E 许多受《X》中广告影响的人不是订阅者
B 与 D 排除 因为原题没有提到今年和价格的问题，属于无关选项
接下来A C E ，画个图
----------------------|-------35以下--------+--------35以上-----|
订者 | 受广告影响 | X1=30%
订者 | 不受广告影响|
非订者 | 受广告影响 | X2 Y1=？
非订者 |不受广告影响 | Y2=？
可以得出的结论如下：
【X1=30% 的所有订者】
【X1+X2>50%（大多数）的受广告影响者】
A选项错误，因为Y1+Y2没有任何交代
C选项错误，正好和第二句结论相反
E选项正确，说明了X2 存在
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