在學生時代，背單詞或者查生詞的時候，我總喜歡只看第一個意思，也不管詞性，也不管這個單詞究竟還有多少意思，反正就只看第一個。

然后，天真地以為會了第一個意思，就會了這個單詞。而一到考試，碰到的單詞，就總是“最熟悉的陌生人”：單詞都背過，意思就是對不上。

所以，今天我要和大家強調的一個問題就是，背單詞一定要全面。要識別這個單詞有幾個詞性，每個詞性都有什么意思。

①Our terrestrial food supply comes from ecosystems transformed to produce a few comestible species through the removal of competitors, predators, and pests, but marine capture fisheries depend on the overall productivity of natural ecosystems. ②There is, however, increasing concern about the impact of fishing and other human activities on marine ecosystems, which are now far from pristine. ③One option for moving toward both biodiversity and terrestrial food supply goals is to produce greater yields from less land, thereby freeing land for conservation purposes. ④By contrast, the objective of maintaining or resorting the biodiversity of marine ecosystems may conflict with the objective of maintaining or increasing our food supply from the sea, since the level of fishing required to achieve the latter may compromise the former.

2. According to the passage, increasing the food yield per unit of land can have which of the following effects?

A. enabling more land to be used for development purposes

B. compromising progress toward conservation goals

C. helping protect comestible species from competition and predation

D. helping reduce pressure on marine ecosystems

E. helping restore the biodiversity of terrestrial ecosystems

-誤區-

這道題，通過題干的定位，相信大家都能找到第三句，然后從定位句可知freeing land for conservation purposes就是題干中所說的effects，哇這個影響不就是節約出土地來起到保護的目的嗎？

選B，因為這樣做的目的就是為了向保護的目的妥協啊。沒問題，結果就選了。