托福寫作模擬試題：新幾內(nèi)亞扁形蟲

　　閱讀主要觀點(diǎn)提取：

　　總論點(diǎn)：新幾內(nèi)亞扁形蟲flatworm通過植物上的泥土傳播到歐洲，并對(duì)歐洲的動(dòng)物造成巨大威脅。有三個(gè)方法可以控制它在歐洲的擴(kuò)張。

　　分論點(diǎn)一：生物控制。一是可以在新幾內(nèi)亞找到這種扁形蟲的捕食者來吃它;二是讓歐洲本土的鳥或爬行動(dòng)物吃它。

　　分論點(diǎn)二：化學(xué)控制。用一種不傷害其他動(dòng)物的殺蟲劑來消滅flatworm。

　　分論點(diǎn)三：土壤消毒。扁形蟲生存在盆栽植物中，并且它不耐高溫。所以只要將所有進(jìn)口的盆栽植物在50攝氏度的水里過濾下，扁形蟲就會(huì)被消滅。

　　聽力主要觀點(diǎn)提�。�

　　總論點(diǎn)：每一種方法是無效的。

　　分論點(diǎn)一：一方面，這種扁形蟲在新幾內(nèi)亞并沒有任何捕食者。另一方面，歐洲本土的鳥類和爬行動(dòng)物也不會(huì)吃它，因?yàn)樗�的肉是酸的，并不好吃�?/P>

　　分論點(diǎn)二：大部分殺蟲劑都不能消滅新幾內(nèi)亞扁形蟲。只有一種名為lindane的殺蟲劑可以消滅它，但是同時(shí)還會(huì)消滅其他動(dòng)物，所以使用這種殺蟲劑得不償失。

　　分論點(diǎn)三：土壤消毒不能消滅歐洲所有扁形蟲。盆栽植物中有很多泥土，即使將盆栽植物傾倒出來，還有一部分依附在植物深處泥土中的扁形蟲并不會(huì)被高溫殺死。

　　學(xué)生滿分范文：

　　The writer puts forward three methods to control the further spread of New Guinea flatworm. However, the professor demonstrates that none of the methods turns out to be successful.

　　First, as for the biological control, the professor contradicts the reading material. On the one hand, the New Guinea flatworm has no predator in its habitat. On the other hand, the local predators in Europe, like birds or reptiles, would not eat the flatworm because its meat tastes sour and unpleasant.

　　Second, the professor illustrates that the chemical control mentioned in the reading is ineffective. It is because that the New Guinea flatworm is resistant to most of pesticides. What’ more, the flatworm would be killed by one type of pesticide, lindane, which is very toxic for other species. So it is not worth to use lindane to kill flatworm.

　　Third, the writer points out that the spread of the flatworm could be prevented by properly sterilizing the soil pots. In contrast, the professor refutes the idea by saying that hot water may not destroy all flatworms. The reason is that flatworms’ older eggs are buried deep within the soil and tipping the pots will not allow the heat to kill the eggs in the deep soil. So they will escape the tip and survive. (214words)