[請益] 黃金閱讀 The Long-Term Stability of Ecosystem

看板TOEFL_iBT (TOEFL_iBT托福)作者centrifugal (阿kenken)時間15年前 (2011/03/29 23:25)推噓1(1推 0噓 0→)

留言1則, 1人參與討論串1/1

黃金16題第7小題 Paragraph 5: Even the kind of stability defined as simple lack of change is not always associated with maximum diversity. At least in temperate zones, maximum diversity is often found in mid-successional stages, not in the climax community. Once a redwood forest matures, for example, the kinds of species and the number of individuals growing on the forest floor are reduced. In general, diversity, by itself, does not ensure stability. Mathematical models of ecosystems likewise suggest that diversity does not guarantee ecosystem stability—just the opposite, in fact. A more complicated system is, in general, more likely than a simple system to break down. (A fifteen-speed racing bicycle is more likely to break down than a child’s tricycle.) 7. Which of the following can be inferred from paragraph 5 about redwood forests? ○They become less stable as they mature. ○They support many species when they reach climax. ○They are found in temperate zones. ○They have reduced diversity during mid-successional stages. 答案是C 但我選A Once a redwood forest matures, for example, the kinds of species and the number of individuals growing on the forest floor are reduced. 這一句不是代表 redwood 變成熟的話他的種類跟數量也會減少? 不知道為什麼不能選A 有請高手解小弟的疑惑謝謝 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 140.113.123.177