OG13-22 不明白。。求各位解！

lysluo90

Only a reduction of 10 percent in the number of
scheduled flights using Greentown's airport will allow
the,delays that are so common there to be avoided.
Hevelia airstrip, 40 miles away, would, if upgraded
and expanded, be an attractive alternative for fully 20
percent of the passengers using Greentown airport.
Nevertheless, experts reject the claim that turning
Hevelia into a full-service airport would end the
chronic delays at Greentown.
Which of the following; if true, most helps to justify
the experts'position?
(A) Turning Hevelia into.a full-service airport would
require not only substantial construction at the
airport itself, but also the construction of new
access highways.
(B) A second largely undeveloped airstrip close to
Greentown airport would be a more attractive
alternative than Hevelia for many passengers
who now use Greentown.
(C) Hevelia airstrip lies in a relatively undeveloped
area but would, if it became a full-service
airport, be a magnet for commercialand
residential development.
(D) If an airplane has to wait to land, the extra jet
fuel required adds significantly to the airline's
costs.
(E) Several airlines use Greentown as a regional
hub, so that most flights landing at Greentown
have many passengers who then take different
flights to reach their final destinations.


答案E,我选了B

1，OA说对B说：This statement indicates that the undeveloped airstrip near Greentown might be a better wayto
alleviate flight delays at Greentown,but it tells us nothing about the effects that converting the
Hevelia airstrip to a full-service airport would have were it to be carried out.
选项说了有比B更好，但没说把H convert之后的结果。但是文章已经说了convert之后移过去20%的人原来机场就不delay了，为什么选项还要再说。。

2，OA对E说：E Correct. This statement provides support for the experts' position because it gives a reason for
thinking that the number of scheduled flights at Greentown would not be reduced, even if Hevelia
airstrip became an attractive alternative for some 20 percent of Greentown's passengers.

原文说 so that most flights landing at Green town have many passengers who then take differentflights to reach their final destinations.
我觉得这里有个many，就是说该转机的让他在老机场转，many以外不转机的让他到H去坐飞机，不是正好分流，避免delay么。。又不是所有乘客都是转机。。

求解！谢谢

PS，那如果B对，什么样的题才应该选除他因的选项啊？？

lysluo90

错错错，如果B不对，
什么题才该选除他因的选项？

怡然yiran

感觉楼主想我以前一样陷入了思维误区。。。原文要的答案是“加强某措施不行”，B是说“另外一个方法也行”，必须无关呀。。。我以前也总是误选这样的选项。。。

个人感觉不能一味地关注“他因”，关注conclusion才是重点。

PS：我记得一般都是“他因削弱”的嘛。。。

个人见解勿喷

九尾

题干的逻辑链是：10%减少班机可以avoid delay H扩建后可以分流20%的乘客 BUT experts ：不可行
B选项out of scope
E选项 Green的飞机most是要转机的 所以H扩建后分流了乘客 却不能分流班机 解释了experts' opinion

cecilia422

同意楼上的！这里是一个陷阱啦~
注意原文说的是：
.Only a reduction of 10 percent in the number of scheduled flights using Greentown’s airport will allow the delays that are so common there to be avoided. Hevelia airstrip, 40 miles away, would, if upgraded and expanded, be an attractive alternative for fully 20 percent of the passengers using Greentown airport.
一个是the number of scheduled flights，后面则是the passengers，是gmat在偷换概念。所以我们读题一定要认真，一不小心就掉进出题老头们挖的陷阱了

Apolloemma

我还有一个疑问呀？

这里是不是真的分流了20%的passenager?

我看这里说的是Hevelia airstrip, would be an attractive alternative for fully 20 percent of the passengers using Greentown airport.

新机场变得20%的旅客有吸引力，能不能说就一定会吸引这20%的客人？

1.如果有吸引力，旅客就被吸引去新机场的话，这个题干犯得就是偷换逻辑概念的问题，减少客人和减少航班之间是不对等的
2.如果有吸引力，但是旅客没被吸引去新机场，题干的犯得逻辑错误就是吸引力不必然造成转换机场这个实质行为，即 某个机场有吸引力-->去这个机场乘飞机  这个式子是不成立的。

我看对choice E的解释，似乎更倾向第二个情况。

zhuangzhilingy

我也有疑问。我感觉你新增加了一条跑道，肯定对延迟会有所缓解的。比如原来机场每天起飞120架飞机，降落100架飞机。增加了一条跑道后，不知道这条跑道是只用来降落还是只用来起飞，不管怎样，它都会分流一部分起飞或降落的飞机。那么原来的那个机场的飞机延迟不就缓和了吗？

zhuangzhilingy

我也有疑问。我感觉你新增加了一条跑道，肯定对延迟会有所缓解的。比如原来机场每天起飞120架飞机，降落100架飞机。增加了一条跑道后，不知道这条跑道是只用来降落还是只用来起飞，不管怎样，它都会分流一部分起飞或降落的飞机。那么原来的那个机场的飞机延迟不就缓和了吗？

zhuangzhilingy

我也有疑问。我感觉你新增加了一条跑道，肯定对延迟会有所缓解的。比如原来机场每天起飞120架飞机，降落100架飞机。增加了一条跑道后，不知道这条跑道是只用来降落还是只用来起飞，不管怎样，它都会分流一部分起飞或降落的飞机。那么原来的那个机场的飞机延迟不就缓和了吗？

落薇裳

zhuangzhilingy 发表于 2013-7-6 23:08
我也有疑问。我感觉你新增加了一条跑道，肯定对延迟会有所缓解的。比如原来机场每天起飞120架飞机，降落100 ...

Only a reduction of 10 percent in the number of
scheduled flights using Greentown's airport will allow
the,delays that are so common there to be avoided.

注意这句话中紫颜色的是句子主干，only强调只有：只有减少10%的航班数量才能使得“航班延误”这件事情被避免。而即使有20%的旅客愿意倾向于选择建好的Hevelia，只要在Greentown的航班数量没有减少10%，那么这20%的旅客减少就不会使得“航班延误” be avoided.

而E选项就证明了这一点。许多航线将Greentown选作中转站，所以新建好的Hevelia对于航班没有吸引力。那么即使在Greentown的旅客数量减少了，航班数量没有减少，那么延误就依然会发生。

有点啰嗦，不知道楼上理解没有？