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

 答案是A，D怎么不好呢？

 答案是A，D怎么不好呢？

我觉得这题中心在说　距离小使得没株的产量减少，但实际上正亩产量增加，让解释原因，我觉得d　不能解释产量增加，如果总的株数增加一倍，但每株的产量减少超过一倍，那正亩总产量还是减少

 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 __________.

(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 成本降低了自然利润上升
(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 无关
(C) with the larger number of plants growing per acre, more fertilizer will be required 削弱
(D) with the spacing between rows cut by half, the number of plants grown per acre will almost double 不能作为conclusion不能说明利润上升, 只能说明种的玉米多了
(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 无关

收成降低利润却可以翻倍, 解释原因.