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托福聽力原文整理版
托�？荚嚨穆犃Ω覀兤綍r一般英語考試聽到的英語聽力當然是存在較大的差距的。因此如何做好聽力這是一個問題。最好的辦法當然就是練習，下面為大家送上一篇托福聽力原文。
The truth is we don't know what the main cause ofextinction of Steller's sea cow was.
真實的情況是，我們并不知道虎頭海牛滅絕的主要原因是什么。
There are problems with each of the theories thatyou read about.
閱讀中的每一個理論都是存在一些問題的。
First, the sea cows were massive creatures.
首先，海牛是非常龐大的生物。
They were up to nine meters long and could weigh over ten tons, just enormous.
它們通常都會達到9米長，而且重達10噸，體型巨大。
A couple of sea cows could feed a small Siberian village for months.
幾個海牛就夠一個西伯利亞小村莊吃幾個月了。
And the population of the native Siberian people wasn't very large.
況且西伯利亞本地人的人口也不是很大。
So while the Siberians certainly did hunt the sea cows, they didn't need to hunt a lot of them.
所以就算是西伯利亞人當時的確捕殺了海牛，那他們也不會捕很多。
So it's unlikely they were the ones who brought the sea cows to the point of extinction.
由此看來他們并不是造成海牛滅絕的原因。
Second, about a hypothetical decrease in kelp caused by ecological disturbances.
其次是關于生態(tài)干擾造成的海藻減少的這個假設。
Well, if something severe really happened in the ecosystem near Bering Island sometimebefore 1768,
如果說1768年之前，白令島附近真的發(fā)生了嚴重的生態(tài)問題，
it would have affected not just the kelp, but also other parts of the ecosystem.
那么這個問題所影響的就不僅僅是海藻了，生態(tài)系統(tǒng)里的其他生物一定也會受到影響。
For example, it would have caused the decline in other marine animals, like whales.
比如說它就會造成其他海洋動物，像鯨魚數(shù)量的下降。
But fishing ships in the area did not report a whale decline.
但是該地區(qū)的捕魚船只并沒有給出鯨魚數(shù)量下降的報告。
Since there is no indication of broader ecosystem problems, the kelp was probably growingjust fine, and the sea cows did not experience food shortage.
由于并沒有更廣泛的生態(tài)問題，海藻很可能就生長的很好并且海牛也沒有經(jīng)歷食物短缺。
Third, it might seem like the European traders were responsible because the sea cows becameextinct soon after the Europeans arrived.
第三，因為海牛在歐洲人到來不久就滅絕了所以歐洲商人的這個理由看起來似乎看起來挺合理的。
But, actually, by the time that the Europeans arrived, the sea cow population was alreadyquite small.
但是實際上，在歐洲人到來之前海牛的數(shù)量已經(jīng)非常的小了。
We have evidence that the sea cow population was at its largest hundreds of years beforethe 1700s.
現(xiàn)在有證據(jù)表明海牛在16世紀之前的數(shù)量達到了它的頂峰。
So something was causing a serious and on-going decrease in the sea cow population longbefore Europeans arrived in the Bering Island area.
所以在歐洲人到達白令島之前，一定有一個東西引起了海牛數(shù)量嚴重、持續(xù)的下降。
Whatever this something was, it should be considered the main cause of the extinction, notthe European traders who were just the last to arrive.
不管這個東西是什么，它都應該是海牛滅絕的主要原因，而不是歐洲商人。
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