OG300难题讨论，有几题不大会～～求讨论

鲜虾鱼丸

直接放题了哈～
1.Scientist: In an experiment, dogs had access to a handle they could pull to release food into a nearby enclosure that contained a familiar dog and nothing else, contained an unfamiliar dog and nothing else, or was empty. The dogs typically released more food to the familiar dog than to the unfamiliar dog. This suggests that dogs are more motivated to help other dogs they know than to help unfamiliar dogs.

The scientist's argument would be most strengthened if it were true that, in the experiment, the dogs with access to the handle tended to release more food when

A. the behavior was being encouraged by a familiar person than when it was being encouraged by an unfamiliar person
B. the enclosure was empty than when it contained an unfamiliar dog
C. An unfamiliar dog in the enclosure was displaying hostility toward them than when an unfamiliar dog in the enclosure appeared friendly
D. a dog in the enclosure appeared uninterested in food already released into the enclosure than when it appeared interested in that food
E. a familiar dog was in the enclosure than when a familiar dog was visible but the enclosure was empty

典座

Vesper1010 发表于 2019-10-28 17:17
想借楼问一下这道题，有伙伴一起讨论吗～
Clearbell Telephone provides slow-dialing (SD) service to cus ...

文章：C电话公司有一个费用低的SD服务，和一个费用高的FD服务。
FD技术提高了，所以每个FD电话的成本比SD低了。
答案是，会计计算得出，C的收益会降低，如果所有客户都用FD服务，但收取低费用。
问在安装费不变的情况下，怎么解释？

猜想：Profit↑=revenue-cost↓
SD revenue低，FD revenue高
现在cost（FD）<cost (SD)了
本来应该P（FD）>P (SD)，但是为什么如果都让客户用FD，profit反而会下降？注意这里影响both SD and FD，因为换成FD的技术之后，SD的收费还是不变的，但是FD收入下降了。

A：从付高费用的顾客得到的额外revenue比额外cost（SD）高。这里有一个很隐晦的点——
Profit（SD）=r（不变）-C↓
Profit（FD）=R（变成low fee）-C↓
所以这里无法判断cost下降了多少。也就无法判断profit增多或者减少。A说[R（FD）-R（变成low fee）]>[cost(SD)-cost↓]，这里明确了变化范围，所以ΔR > Δcost, 所以收入减少了。

ACEmiranda

能也给我邮箱发一份吗

wangerke

答案？

Bensontuo

Question type: Strengthen

Argument structure

Correlation to prove causation

A. We do not necessary need the action of helping be " encouraged " by whom be helped, the action could also be autonomously.

B. It is not necessary to be empty for the foods released to whom are not familiar with. It could be less, but not empty.

C. Weaken option by introducing other possible cause.

D. Not really relevant

E. Totally a fantastic necessary assumption answer to best support the argument that the whole action of helping are purely out of his sights of seeing a familiar dog.

最菜惹

楼主怎么样了，这些题这是难呀

oatmilk

楼主 可以发一下300题吗， 谢谢

小酶酶

跪求可不可以留邮箱求一份300题的资料呢。。。还有20天考试，跪谢。。。
不胜感激。。。。

Wdrrrrrrr

同求300题！ 私信给你邮箱可以吗

Vesper1010

Since 1978 when the copyright law was changed, books that are less than fifty years old must not be photocopied without the publisher’s permission. Thus, any book that has been photocopied since 1978 without the publisher’s permission must be at least fifty years old.

The reasoning above exhibits a flaw similar to one in which of the following?

A Any member of the solar system must be either a planet or a moon, so if an asteroid is neither a planet nor a moon, it must not be a member of the solar system.
B Anyone who rides a city bus must buy a bus pass, and since Demetrios has a bus pass, he must be riding on a city bus.
C A driver who turns right must signal, so any driver who did not signal must not have turned right.
D Anyone who legally crosses a national boundary must have a passport; thus anyone who does not have a passport cannot legally cross a national boundary.
E Any wage earner residing in the state must pay state taxes, so since Blodwen pays state taxes, she must be resident in the state.