1. 生物生态类考察点-物种(动、植物)骤减or 剧增
理论：hypothesis, explanation,cause, theory
动物：predator, predation, pollution, climate change, habitat...
植物：climate change, insect, human action
动物：ecosystem, local species, food chain
动物：virus, human action
植物：pesticide, assisted migration, research center, genetic modification
Topic: CT measures to stop CT in AUS
R1: national fence
R2:captured & destroyed by V'
L1 X stop young T & T eggs - rivers+stream one-another
L2 V bt destroy native frogs X tell CT from frogs
L3 X original habitat in SA rep+amphibians by re+pet collectors - ecological disaster - vital in America
开头段： 表明topic +各自的立场
The lecturer argues againstthe three measures mentioned in the reading passage to reduce the population of the cane toad, a species introduced to the Australian continent.
The lecturer argues that the first measure, a national fence, would not prevent the flow of streams or rivers and,(听力观点) therefore, would allow young toads or toad eggs to travel to the other side of the fence. (反驳理由)The reading passage, however, argues that such a fence would effectively cut off the Route that animals use to establish colonies and expand in population.(阅读观点)
Regarding the second measure, recruiting a large group of volunteers, the lecturer explains that volunteers often have difficulty distinguishing between cane toads and native frogs, an endangered species. Therefore, volunteers might kill members of both species. (听力观点+反驳理由)The Reading passage gives the opposite view. Organizing a large group of volunteers to join an extermination campaign would speed the destruction of cane toads.(阅读观点)
Finally the lecturer objects to the third measure—using an infectious virus. She points out that a virus intended to eliminate Australia's cane toad population could be transmitted through animal transportation to other continents where cane toads are an essential part of the ecosystem. (听力观点+反驳理由)This is indirect contradiction with the claim in the reading passage that an infectious virus could be developed to stop the reproduction of cane toads without harming other species.(阅读观点)
驳斥： refute, disagree with, cast doubts on, challenge, oppose, conflict with, deny the statement of, contradict
支持：support, enhance, hold, advocate,
转折：in contrast, however, on the other hand, on contrary, while
列举：first, second,third, first of all, secondly, also, finally, in the first place, futhermore, moreover