While many people think of genetic manipulation of food crops as being aimed at developing larger and larger plant varieties, some plant breeders have in fact concentrated on discovering or producing dwarf varieties, which are roughly half as tall as normal varieties.

Which of the following would, if true, most help to explain the strategy of the plant breeders referred to above?


Plant varieties used as food by some are used as ornamentals by others.

The wholesale prices of a given crop decrease as the supply of it increases.

Crops once produced exclusively for human consumption are often now used for animal feed.

Short plants are less vulnerable to strong wind and heavy rains.

Nations with large industrial sectors tend to consume more processed grains.

考题讲解

情景:很多人认为食用作物的基因操纵是为了创造出越来越大的植物品种,但是一些植物育种家集中力量研究大约只有正常品种一半高度的矮小的品种。

推理:本题的解题非常简单,其实就是找到矮小植物的优点即可(方案推理,找到方案的优势)。

选题方式:

选项分析:

A选项:有些人把植物品种作为食物,有些人把它们作为装饰物。本选项和矮小植物无关。

B选项:食用作物在供给增加的时候价格下降。本选项和矮小植物无关。

C选项:原仅供人类食用的食物现在也用于动物饲养。本选项和矮小植物无关。

D选项:
 Correct. 矮小植物更不容易被大风和大雨所侵害。本选项描述了矮小植物的优点。

E选项:
拥有大的工业部门的国家更愿意消费处理过的谷物。本选项和矮小植物无关。

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