我把我自己的思路贴出来，请你们帮分析一下到底错在哪
Eurasian watermilfoil, a weed not native to Frida Lake, has reproduced prolifically since being accidentally introduced there. In order to eliminate the weed, biologists proposed treating infested parts of the lake with a certain herbicide [that is nontoxic for humans and aquatic animals]. However, the herbicide might damage populations of certain rare plant species that the lake contains. For this reason local officials rejected the proposal. Which of the following, if true, points out the most serious weakness in the officials' grounds for rejecting the biologists' proposal? Ew是一种草，大量繁殖 为了消灭这种草，生物学家建议用无害的除草剂去治理被感染的地方 然而，除草剂可能会破坏稀有植物，所以官员否定这个建议 | The continuing spread of Eurasian watermilfoil in Frida Lake threatens to choke out the lake's rare plant species. | | Because of ecological conditions prevailing in its native habitat, Eurasian watermilfoil is not as dominant there as it is in Frida Lake. | | The proliferation of Eurasian watermilfoil in Frida Lake has led to reductions in the populations of some species of aquatic animals. | | Although Eurasian watermilfoil could be mechanically removed from Frida Lake, eliminating the weed would take far longer this way than it would using herbicides. | | Unless Eurasian watermilfoil is completely eliminated from Frida Lake, it will quickly spread again once herbicide treatments or other control measures cease. |
答案选A，我自己选的E 下面是我的想法
A- 杂草使珍稀植物死亡，说了杂草怎样，问题是除草剂和珍稀植物之间的关系
B- 说的是native habitat和F湖的关系，不关心；还说dominant的问题，更不关心 C- 杂草的扩散降低海洋生物的数量，还说没说到除草剂 D- Mechanically消除比用除草剂时间长，时间比较，不关心 E- 除非杂草完全被消除，杂草很快又会再扩散只要除草剂停止使用，说了除草剂的一个缺点-没有根治性，要一直一直用这个除草剂知道完全消除 | 
京公网安备11010202008513号 京ICP证101109号 京ICP备12012021号
发表于 2014-7-3 10:52:12
收藏
收藏
楼主
