prep2-4

欧阳小西

支持11楼
总之D的cost 肯定增加

dreamistrue

choice (d) contains something that is actually self-evident from the information that's already in the passage.
in other words, if you cut the spacing between rows by 1/2, then by definition you're going to be able to plant about twice as many plants. therefore, (d) is simply a repetition of what's already in the argument, and adds virtually nothing.