21.
When limitations were in effect on nuclear-arms testing, people tended to save more of their money, but when nuclear-arms testing increased, people tended to spend more of their money. The perceived threat of nuclear catastrophe, therefore, decreases the willingness of people to postpone consumption for the sake of saving money.
The argument above assumes that
A. the perceived threat of nuclear catastrophe has increased over the years.
B. most people supported the development of nuclear arms
C. people’s perception of the threat of nuclear catastrophe depends on the amount of nuclear-arms testing being done
D. the people who saved the most money when nuclear-arms testing was limited were the ones who supported such limitations
E. there are more consumer goods available when nuclear-arms testing increases
n-a testing 多，人们消费增加（前提）
因为感觉到来自nuclear catastrophe的威胁所以人们消费增加（结论）
这应该是因果型结论吧？
答案c：n-a testing的数目决定人们对危险的知觉。
以前我肯定说这是架桥梁。但是根据lawyer的因果型结论分析应该是找排除他因的答案。这里我看不出哪里是他因。还是我对Lawyer的解题方法理解有偏差？
36.
If the airspace around centrally located airports were restricted to commercial airliners and only those private planes equipped with radar, most of the private-plane traffic would be forced to sue outlying airfields. Such a reduction in the amount of private-plane traffic would reduce the risk of midair collision around the centrally located airports.
The conclusion draw in the first sentence depends on which of the following assumptions?
A. Outlying airfields would be as convenient as centrally located airports for most pilots of private planes.
B. Most outlying airfields are not equipped to handle commercial-airline traffic.
C. Most private planes that use centrally located airports are not equipped with radar.
D. Commercial airliners are at greater risk of becoming involved in midair collisions than are private planes.
E. A reduction in the risk of midair collision would eventually lead to increases in commercial-airline traffic.
若中心地带的机场只供装了雷达的私家机使用，那么私家机只能永远离中心的机场。
这个应该是条件型结论吧？
答案C：用中心地带的私家机大多未装雷达
这里若是私家机都装了雷达那么他们就不用离开中心机场了。是不是排除了有充分条件但是推不出必要条件的情况？
48.
A researcher discovered that people who have low levels of immune-system activity tend to score much lower on tests of mental health than do people with normal or high immune-system activity. The researcher concluded from this experiment that the immune system protects against mental illness as well as against physical disease.
The researcher’s conclusion depends on which of the following assumptions?
A. High immune-system activity protects against mental illness better than normal immune-system activity does.
B. Mental illness is similar to physical disease in its effects on body systems.
C. People with high immune-system activity cannot develop mental illness.
D. Mental illness does not cause people’s immune-system activity to decrease.
E. Psychological treatment of mental illness is not as effective as is medical treatment.
Og的解释很清楚：The researcher concludes from the association of low immune-system activity with low mental-health sores that, in effect, immune system activity can inhibit mental illness. If, contrary to D, mental illness can depress immune-system activity, the association mentioned does not support the researcher’s conclusion.这里前提结论型文章，但我觉得结论是第二句，而根据OG的解释结合解题方法，似乎符合因果型结论中的因果没颠倒的答案。
我知道我搞混了很多概念，也有点想得太复杂了，但很想搞清楚具体如何使用前人的经验，能掌握有效找到答案的方法。
望讨论！在此先谢过了。问了一些有些傻傻的问题大家可千万别见怪阿。。。
谢谢！！！
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发表于 2006-4-16 21:47:00
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