求教prep cr2-4

fengyeming

Which of the following most logically completes the argument?



A new machine for harvesting corn will allow rows to be planted only fifteen inches apart, instead of the usual thirty inches.Corn planted this closely will produce lower yields per plant.Nevertheless, the new machine will allow corn growers to double their profits per acre because __________.



(A) with the closer spacing of the rows, the growing corn plants will quickly form a dense canopy of leaves, which will, by shading the ground, minimize the need for costly weed control and irrigation

(B) with the closer spacing of the rows, corn plants will be forced to grow taller because of increased competition for sunlight from neighboring corn plants

(C) with the larger number of plants growing per acre, more fertilizer will be required

(D) with the spacing between rows cut by half, the number of plants grown per acre will almost double

(E) with the closer spacing of the rows, the acreage on which corn is planted will be utilized much more intensively than it was before, requiring more frequent fallow years in which corn fields are left unplanted

请问下这道题的D什么不对呢，谢谢！！！

iceberg07

谈一下我的看法，不一定对。
利润＝售价－费用
D的选项是可以长更多的庄稼，属于一个很大的迷惑项。长的庄稼多不一定收成好，即使收成好也不意味着可以卖好价钱；而且庄稼多意味着所需费用也相应增高，更不一定能double利润了。最直接的还是费用降低。

Which of the following most logically completes the argument?



A new machine for harvesting corn will allow rows to be planted only fifteen inches apart, instead of the usual thirty inches.Corn planted this closely will produce lower yields per plant.Nevertheless, the new machine will allow corn growers to double their profits per acre because __________.



(A) with the closer spacing of the rows, the growing corn plants will quickly form a dense canopy of leaves, which will, by shading the ground, minimize the need for costly weed control and irrigation

(B) with the closer spacing of the rows, corn plants will be forced to grow taller because of increased competition for sunlight from neighboring corn plants

(C) with the larger number of plants growing per acre, more fertilizer will be required

(D) with the spacing between rows cut by half, the number of plants grown per acre will almost double

(E) with the closer spacing of the rows, the acreage on which corn is planted will be utilized much more intensively than it was before, requiring more frequent fallow years in which corn fields are left unplanted

请问下这道题的D什么不对呢，谢谢！！！

-- by 会员 fengyeming (2010/4/27 22:54:42)

ansonchan

和LZ一样也做错了这道题呢。。

不过后来想了一下，发现了CR里都是选对题意影响最直接的一项，A选项明显指出了costly，也就是影响利润的主要因素（如2楼所言）。所以会更好吧。

如果D可以的话那B感觉也可以的，但是他们都不直接说出对profits的影响。

totalgloria

这道题不知道我理解的对不对~
做的时候是这样想的
D选项说crop的数量会almost double,而题中明确指出 lower yield per plant,所以总的来说，利润就会lower than double啦
所以排除D选项

agan14404102

大家说的都有道理

ArsèneSONG

感觉LLS 讲的不太正确，对于公式简单我们认为：
利润=收入-成本=单个plant产量*plant数量-成本
原来   1=   2-1  =     1*2-1
现在   2=3.2-1.2=3.8*0.84-1.2
也就是说，利润翻倍的情况下（1 —— 2），假设成本也略微上涨（1——1.2），根据题目单个植物的产量下降（1——0.84），我们可以得到新的plant数量（2——3.8），其实是符合D选项（plant数量almost double)的。

而且第一个回答中提到的同样可以oppose A选项，成本下降也不一定利润上升，可能OA不是D的原因是因为D选项不如A选项直接，A选项直接通过成本影响，而D选项通过影响产量影响收入再影响利润。

lisiberry

ArsèneSONG 发表于 2017-3-4 17:07
感觉LLS 讲的不太正确，对于公式简单我们认为：
利润=收入-成本=单个plant产量*plant数量-成本
原来   1=   ...

这道题选A。B个子高不代表能省钱。https://www.manhattanprep.com/gmat/forums/machine-harvesting-corn-gmat-prep-cr-t7689.html

JuliaC2017

iceberg07 发表于 2010-4-27 23:32
谈一下我的看法，不一定对。利润＝售价－费用D的选项是可以长更多的庄稼，属于一个很大的迷惑项。长的庄稼 ...

Mark一下！