In this reading material, three reasons are given to prove the advantages and feasibility of the methods to vanish the cane toad. However, the lecturer raises serious counter arguments against the reading paragraphs by providing different consequences of these methods.开头段简洁明了，好
First of all, the author points out that the construction of a national fence can help discourage the toad from moving to places that are not colonized yet. However,the lecturer mentions that it cannot work because unlike the rabbits, toads are animals that can move by water？by water是听力材料的原话嘛？如果不是，那这里用法好像有问题，by water是乘船的意思. Their youngsters and eggs can be carried by the stream to move anywhere. Streams and rivers cannot be limited by the fence. As a result, their population would increase all over the 去掉Australia.国家名只有USA UK这样的缩写才加the
Second, a solution to this problem is that volunteers can engage in this campaign to destroy the toad, as the author considers. What’s more, the government can play a leading role to organize citizens. However, the lecturer holds an opposite view. He contends that this action is prone to be detrimental to other animal’s animals'实际上一般这种's的从属格结构一般只用在人身上，比较少用在动物、物品上 survival, especially one kindspecies of frogs frog that is endangered(这里不必用一个定语从句). Because volunteers have little professional knowledge, they fail to distinguish the cane toad from other animals.
Finally, the lecturer states that the introduction of virus to eliminate the toad population is inadvisable, contradicting what is presented in the third method that the virus which does harm on the toad only can be effective. According to the lecturer, this virus would be transported to the America by ship where the toad is a natural part of the ecosystem. Therefore, the virus would pose threaten to the local toad in America, affecting the original habitat.
To sum up, the contents of the reading passage are refuted by the professor. It is obvious that the professor holds a totally opposite idea on the solutions in thereading, which are aimed to decrease the population of cane toads in Australia.