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托福TPO10綜合寫(xiě)作參考范文及材料
海獺是一種生活在北美西海岸從加州到阿拉斯加沿線的小型海洋哺乳動(dòng)物。托福TPO10綜合寫(xiě)作就海獺數(shù)量減少的原因進(jìn)行了分析。下面是小編整理的托福TPO10綜合寫(xiě)作參考范文，希望能幫到大家!
托福TPO10綜合寫(xiě)作參考范文
The lecturer and the reading passage suggest two competing theories, the predation theory vs. the pollution theory, to explain why the sea otter population is in rapid decline.
The professor reasons that the absence of dead sea otters washed up the coast suggests that their decline is not caused by sea pollution but rather by sea predators who consume their bodies after Killing them. In contrast, the reading passage attributes the death of sea otters to pollution, citing evidence of increased sources of ocean contaminants which lead to greater vulnerability to infections.
Furthermore, the lecturer argues that orcas are likely factors in the disappearance of sea otters, because the scarcity of whales, their usual prey, has left them with no other choice but to start hunting smaller mammals like the otters for food. The reading passage, on the other hand, Rules out this theory based on the orca's preying habit, and instead approves of the pollution theory as the only explanation for the decline op both large and small sea mammals across the entire ecosystem.
Finally, according to the lecturer, the uneven pattern of sea otter decline corresponds to the distribution of the orcas. she argues that the pact that their population has declined most rapidly where orcas are most prevalent further validates the predation theory. However, the reading passage argues that changeable environmental factors, which lead to different concentrations of pollutants, better explains the varying pattern of sea otter decline.
托福TPO10綜合寫(xiě)作閱讀材料：
The sea otter is a small mammal that lives in waters along the western coast of North America from California to Alaska. When some sea otter populations off the Alaskan coast started rapidly declining a few years ago, it caused much concern because sea otters play an important ecological role in the coastal ecosystem. Experts started investigating the cause of the decline and quickly realized that there were two possible explanations: environmental pollution or attacks by predators. Initially, the pollution hypothesis seemed the more likely of the two.
海獺是一種生活在北美西海岸從加州到阿拉斯加沿線的小型海洋哺乳動(dòng)物。幾年前，阿拉斯加海岸的海獺數(shù)量急劇減少。由于海獺對(duì)于維持海岸沿線生態(tài)平衡有非常重要的作用，所以其數(shù)量下降引起了廣泛的關(guān)注。專(zhuān)家開(kāi)始研究海獺數(shù)量下降的原因，并且很快發(fā)現(xiàn)了兩個(gè)可能的原因，分別是環(huán)境污染和天敵捕食。最初，環(huán)境污染說(shuō)看起來(lái)更為可信。
The first reason why pollution seemed the more likely cause was that there were known sources of it along the Alaskan coast, such as oil rings and other sources of industrial chemical pollution. Water samples from the area revealed increased levels of chemicals that could decrease the otters’ resistance to life-threatening infections and thus could indirectly cause their deaths.
為什么污染說(shuō)更為可信呢?這是因?yàn)榘⒗辜雍０洞_實(shí)有污染源，比如石油帶或者其他的.工業(yè)污染物。該地的水樣顯示水中化學(xué)物的含量增加，其數(shù)量可以導(dǎo)致海獺對(duì)于對(duì)于一些致命感染喪失抵抗力，進(jìn)而間接導(dǎo)致數(shù)量下降。
Second, other sea mammals such as seals and sea lions along the Alaskan coast were also declining; indicating that whatever had endangered the otters was affecting other sea mammals as well. This fact again pointed to environmental pollution, since it usually affect the entire ecosystem rather than a single species. Only widely occurring predators, such as the orca (a large predatory whale), could have the same effect, but orcas prefer to hunt much larger prey, such as other whales.
第二，在阿拉斯加海域，包括海豹和海獅在內(nèi)的其他海洋哺乳動(dòng)物的數(shù)量也有所下降。這表明造成海獺數(shù)量下降的原因也對(duì)其他海洋哺乳動(dòng)物造成了影響。原因再次指向了環(huán)境污染，這是因?yàn)榄h(huán)境污染問(wèn)題常常不是僅僅影響某個(gè)特定物種，而是影響整個(gè)生態(tài)系統(tǒng)。除此之外，只有像逆戟鯨(一種大型肉食鯨)那種食性廣泛的動(dòng)物才能通過(guò)捕食呈現(xiàn)相同的效果。但是，逆戟鯨更喜歡捕食像鯨類(lèi)這種的大型獵物。
Third, scientists believed that the pollution hypothesis could also explain the uneven pattern of otter decline: at some Alaskan locations the otter populations declined greatly, while at others they remained stable. Some experts explained these observations by suggesting that ocean currents or other environmental factors may have created uneven concentrations of pollutants along the coast.
第三，科學(xué)家認(rèn)為污染說(shuō)同時(shí)可以解釋海獺數(shù)量變化的不均衡性。所謂不均衡性是指在阿拉斯加某些區(qū)域海獺數(shù)量下降明顯，而在其他地方海獺的數(shù)量保持未定。一些專(zhuān)家指出這樣的觀察結(jié)果表明洋流和其他環(huán)境因素導(dǎo)致了海岸線上污染物的不均衡聚集。
托福TPO10綜合寫(xiě)作聽(tīng)力材料：
Well, ongoing investigations have revealed that predation is the most likely cause of sea otter decline after all.
目前的研究表明天敵捕食是最可能導(dǎo)致海獺數(shù)量減少的原因。
First, the pollution theory is weakened by the fact that no one can really find any Dead Sea otters washing off on Alaskan beaches. That’s not what you would expect if infections caused by pollution started killing a lot of otters. On the other hand, the fact that it’s so hard to find dead otters is consistent with the predator hypothesis. If an otter is killed by a predator, it’s eaten immediately so it can’t wash up on shore.
首先，由于沒(méi)有人發(fā)現(xiàn)有海獺尸體被沖上阿拉斯加海灘，所以污染理論捕食那么站得住腳的。如果污染造成的疾病感染導(dǎo)致了海獺數(shù)量的劇減，那么情況不該如此。而且，很少發(fā)現(xiàn)海獺尸體也恰恰說(shuō)明了天敵捕食假說(shuō)。捕食者殺死了海獺后，會(huì)很快地吃掉它，那么我們也就不會(huì)再岸上發(fā)現(xiàn)海獺尸體了。
Second, although orcas may prefer to hunt whales, whales have essentially disappeared from the area because of human hunters. That means that orcas have had to change their diet to survive and since only smaller sea mammals are now available, orcas have probably started hunting those. So, it probably is the orcas that are causing the decline of all the smaller sea mammals mentioned in the passage - the seals, the sea lions, and the sea otters.
第二，盡管逆戟鯨喜歡捕食鯨類(lèi)，但是鯨類(lèi)的數(shù)量卻由于人類(lèi)的捕獵活動(dòng)而劇烈減少。這意味著逆戟鯨不得不為了生存而更改捕食習(xí)慣。目前來(lái)看只有一些小型海洋哺乳動(dòng)物還可以捕捉，逆戟鯨很可能開(kāi)始以它們?yōu)槭沉�。所以，很可能是逆戟鯨的捕食導(dǎo)致了文中提到的諸如海豹、海獅和海獺等小型哺乳動(dòng)物的數(shù)量減少。
And third, the uneven pattern of otter decline is better explained by the orca predation theory than by the pollution theory. What happens to otters seems to depend on whether the location where they live is accessible to orcas or not. In those locations that orcas can access easily, the number of sea otters has declined greatly. However, because orcas are so large, they can’t access shallow or rocky locations. And shallow and rocky locations are precisely the types of locations where sea otter populations have not declined.
第三，海獺數(shù)量變化的不均衡性恰好表明了逆戟鯨捕食理論比污染理論更合理。海獺數(shù)量的.增減取決于它們生存的地方逆戟鯨是不是可以進(jìn)入。在那些逆戟鯨很容易進(jìn)入的海域，海獺的數(shù)量急劇減少。然而，因?yàn)槟骊L個(gè)頭很大，所以他們不能進(jìn)入那些過(guò)淺或者充滿(mǎn)巖石的海域。而那些過(guò)淺和充滿(mǎn)巖石的海域，恰恰是海獺數(shù)量保持穩(wěn)定的地區(qū)。
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