OG 的题，请答疑，谢谢og-37,og-48

qierliu

OG-37. 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.
Which of the following, if true, would most strengthen the conclusion drawn in the second sentence?
A. Commercial airliners are already required by law to be equipped with extremely sophisticated radar
systems.
B. Centrally located airports are experiencing overcrowded airspace primarily because f sharp increases in
commercial-airline traffic.
C. Many pilots of private planes would rather buy radar equipment than be excluded from centrally located
airports.
D. The number of midair collisions that occur near centrally located airports has decreased in recent years.
E. Private planes not equipped with radar systems cause a disproportionately large number of midair collisions
around centrally located airports.

为什么是E呢？我觉得D更对啊，难道是因为问题中的DRAWN IN吗？

OG-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.

是取非题吗？我不知道怎么解释。什么时候是取非啊？

mythicalman

1，把题目好好读读，就知道选E了

2，选D,原文中mental health和immune system是corrolation,但结论是immunce system decides mental health. 所以必须排除mental health decides immune system的可能性，所以选D

番茄炒蛋

第一题主要是解释那个现象就可以了，把那些小飞机赶走以后为什么撞机事件就少了呢，因为那些飞机就是撞机的主要原因
而D里面的 in recent years和原文更本就没有关系啊
你还是去看看陈向东的书吧

cocoabean

1.That the number of midair collisions has recently decreased is

irrelevant to whether the proposed reduction would further reduce collisions, so D is

inappropriate. 只是提到减少, 但没有涉及原因 a reduction in the amount of private-plane traffic.

zhoushao

以下是引用mythicalman在2003-11-19 1:49:00的发言：

2，选D,原文中mental health和immune system是corrolation,但结论是immunce system decides mental health. 所以必须排除mental health decides immune system的可能性，所以选D

精辟！

谢谢这位GG，偶一下子就明白了

vivinzone

perfect!

我爱欧洲

OG37：题干说的是一种假设，要求加强该假设的结论。而D是过去的情况，即使以后仍然下降，也与假设的效果无关。

tom_2008

太经典了

swlfx

多谢。

new_land

以下是引用mythicalman在2003-11-19 1:49:00的发言：
2，选D,原文中mental health和immune system是corrolation,但结论是immunce system decides mental health. 所以必须排除mental health decides immune system的可能性，所以选D

厉害！选项D是清楚为什么对了！

但是选项B为什么错了呢？