OG300难题讨论，有几题不大会～～求讨论

peion

楼主可以给我发一份吗！！

Angel_WangZ

樓主，有沒有數學的解析呀？300題只有答案沒有解析，好痛苦。

鲜虾鱼丸

Angel_WangZ 发表于 2019-10-23 10:50
樓主，有沒有數學的解析呀？300題只有答案沒有解析，好痛苦。

呜呜我也只有v的解析 没有q的

estertss

啊啊才看到！！谢谢楼主  771281300 发到这个qq的邮箱就可以了。再次感谢

鲜虾鱼丸

呜呜大家要的去GMAT770公众号上自取吧 我就是在那个上面找的

Kara七百加

1、E   2、D   3、E    4、A
不确定的嘿嘿。等楼主放答案讨论。

Vesper1010

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 customers for a low fee, and fast-dialing (FD) service to other customers who pay a somewhat higher fee. FD technology, however, is so efficient that it costs Clearbell substantially less per average call to provide than does SD. Nonetheless, accountants have calculated that Clearbell’s profits would drop if it provided FD to all its customers at the current low-fee rate.

Assume that installation costs for FD are insignificant if the customer already has SD service. Which of the following, if true about Clearbell, best explains the results of the accountants’ calculation?

A The extra revenue collected from customers who pay the high fee is higher than the extra cost of providing SD to customers who pay the low fee.
B The low fee was increased by 6 percent last year, whereas the higher fee was not increased last year.
C Although 96 percent of customers regard FD service as reliable and more convenient than SD, fewer than 10 percent of them choose to pay the higher fee for FD service.
D The company’s competitors generally provide business customers with FD service at low-fee rates.
E Profits rose slightly each month for the first three months after FD was first offered to customers, then fell slightly each month for the succeeding three months.

Vesper1010

Meteorologists say that if only they could design an accurate mathematical model of the atmosphere with all its complexities, they could forecast the weather with real precision. But this is an idle boast, immune to any evaluation, for any inadequate weather forecast would obviously be blamed on imperfections in the model.

Which of the following, if true, could best be used as a basis for arguing against the author’s position that the meteorologists’ claim cannot be evaluated?

A Certain unusual configurations of data can serve as the basis for precise weather forecasts, even though the exact causal mechanisms are not understood.
B Most significant gains in the accuracy of the relevant mathematical models are accompanied by clear gains in the precision of weather forecast
C Mathematical models of the meteorological aftermath of such catastrophic events as volcanic eruptions are beginning to be constructed.
D Modern weather forecasts for as much as a full day ahead are broadly correct about 80 percent of the time.
E Meteorologists readily concede that the accurate mathematical model they are talking about is not now in their power to construct.

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.

Wdrrrrrrr

同求300题！ 私信给你邮箱可以吗