GMAT CR 解释（Explanation）题思路汇整
本篇文章将讲述Dustin在做解释题时，是如何预测正确答案方向的。尽管不能100%适合所有解释题，但已经能涵盖70%解释题的套路。Dustin认为，这样就很足够大家在读完文章后掌握正确答案的可能方向，在浏览五个选项时也能够帮助思考，快速辨认出最有可能的正确选项。
简单来说，就是在读文章时抓住解释题的两个矛盾事实，立刻辨认是否属于下列三类型“好用/不用”“下降/上升”“不变/改变”。辨认出之后，就能按照如下的预测方向检视五个选项。当今天发现某选项能够推到刚刚预测的方向，就非常有可能是正确答案。
好用/不用
不確定自己現在幾分？
12 題免費測出分數區間 →
- 好用却不用：有额外缺点/丧失原先优点。
- 不好用却用了：有额外优点/少了原先缺点。
Suncorp, a new corporation with limited funds, has been clearing large sections of the tropical Amazon forest for cattle ranching. This practice continues even though greater profits can be made from rubber tapping, which does not destroy the forest, than from cattle ranching, which does destroy the forest.
明明rubber tapping赚钱又不破坏环境，但却还是cattle ranching：好用却不用
Which of the following, if true, most helps to explain why Suncorp has been pursuing the less profitable of the two economic activities mentioned above?
(E) The amount of money required to begin a rubber-tapping operation is twice as high as the amount needed to begin a cattle ranch.
rubber tapping花钱：额外缺点。
下降/上升
- 下降却上升：额外上升/其他下降减缓
- 上升却下降：额外下降/其他上升减缓
In order to withstand tidal currents, juvenile horseshoe crabs frequently burrow in the sand. Such burrowing discourages barnacles from clinging to their shells. When fully grown, however, the crabs can readily withstand tidal currents without burrowing, and thus they acquire substantial populations of barnacles. Surprisingly, in areas where tidal currents are very weak, juvenile horseshoe crabs are found not to have significant barnacle populations, even though they seldom burrow.
螃蟹身上海草该多但却变少：上升却下降
Which of the following, if true, most helps to explain the surprising finding?
(E) Until they are fully grown, horseshoe crabs shed their shells and grow new ones several times a year.
螃蟹会定期脱壳：额外下降。
不变/改变
- 改变却不变：反向变化
- 不变却改变：同向变化
Plan: Concerned about the welfare of its senior citizens, the government of Runagia decided two years ago to increase by 20 percent the government-provided pension paid to all Runagians age sixty-five and older.
Result: Many Runagian senior citizens are no better off financially now than they were before the increase.
Further information: The annual rate of inflation since the pension increase has been below 5 percent, and the increased pension has been duly received by all eligible Runagians.
给老人的钱多了，生活水准却不变：改变却不变
In light of the further information, which of the following, if true, does most to explain the result that followed implementation of the plan?
(C) The prices of goods and services that meet the special needs of many senior citizens have increased at a rate much higher than the rate of inflation.
老人用的东西价格涨幅高：反向变化。
Hollywood restaurant is replacing some of its standard tables with tall tables and stools. The restaurant already fills every available seat during its operating hours, and the change in seating arrangements will not result in an increase in the restaurant’s seating capacity. Nonetheless, the restaurant’s management expects revenue to increase as a result of the seating change without any concurrent change in menu, prices, or operating hours.
餐厅容纳人数不变但营收却上升：不变却改变
Which of the following, if true, provides the best reason for the expectation?
(B) Diners seated on stools typically do not linger over dinner as long as diners seated at standard tables.
翻桌率上升：同向变化。
