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题库 / Prep2007E2-CR-4
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 __________.
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
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
with the larger number of plants growing per acre, more fertilizer will be required
with the spacing between rows cut by half, the number of plants grown per acre will almost double
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
给结论找原因，结论是 double their profits per acre ，即每亩利润翻一倍；
已知一个前提 Corn will produce lower yields per plant，即每株植物的产量下降；
现在要出一个理由在产量下降的情况下，利润还要翻倍。
A.减少costly的成本，可以实现利润增加；
B.因为题干已经说了产量下降，长高也没用，不能增加利润；
C.增加肥料成本，减少利润
D.每亩产量=每亩植株数*每株植物的产量，每亩植株数将近增加2倍，但是每株植物产量下降，未给出下降多少，如果产量下降一半，则不影响每亩产量，不能使利润翻倍；
E.休耕期增加，减少利润。
经比较A和D两个选项，A选项更优。
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