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[HANNAH KIWI老师已改] 托福写作——[综合]+[Tpo34]26号考试谢谢老师

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发表于 2018-5-17 11:21 |显示全部楼层
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A huge marine mammal known as Steller's sea cow once lived in the waters around Bering Island off the coast of Siberia. It was described in 1741 by Georg W. Steller, a naturalist who was among the first Europeans to see one. In 1768 the animal became extinct. The reasons for the extinction are not clear. Here are three theories about the main cause of the extinction.
First, the sea cows may have been overhunted by groups of native Siberian people. If this theory is correct, then the sea cow population would have originally been quite large, but hundreds of years of too much hunting by the native people diminished the number of sea cows. Sea cows were a good source of food in a harsh environment, so overhunting by native people could have been the main cause of extinction.
Second, the sea cow population may have become extinct because of ecosystem disturbances that caused a decline in their main source of food, kelp (a type of sea plant). Kelp populations respond negatively to a number of ecological changes. It is possible that ecological changes near Bering Island some time before 1768 caused a decrease of the kelp that the sea cows depended on.
Third, the main cause of extinction of the sea cows could have been European fur traders who came to the island after 1741. It is recorded that the fur traders caught the last sea cow in 1768. It thus seems reasonable to believe that hunting by European fur traders, who possessed weapons that allowed them to quickly kill a large number of the animals, was the main cause of the sea cow's extinction.




听力材料
Question
Summarize the points made in the lecture, being sure to explain how they challenge the specific theories presented in the reading passage.





Response

The lecture and the reading both discuss the reasons for the extinction of sea cows. While the reading states three possible theories about the main cause, the lecture refuses all the theories.

First of all, the reading claims that it is overhunted by local people that leads to the extinction. However, the lecture argues that this reason is untenable. Furthermore, the professor states that since these cows are of the massive size and the small number of local population, there is no need to hunt a lot in order to meet the basic supply.

In addition, the reading makes the argument that ecological disturbance may result in massive extinction. The lecture counters this point by stating that if the disturbance in ecology happens, then other animals will necessarily be affected. According to the professor,  animals like marine whales live normally and this theory is lack of reports and evidence.

Lastly, the reading passage argues that it is European fur traders that should be blamed. The lecture refuse this claim by pointing out that numbers of sea cows have already been declined before traders arrived.  Moreover, the professor suspects that something serious must have happened long before the arrival of Europeans.

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发表于 2018-5-17 11:21 | 小站托福TPO客户端

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发表于 2018-5-19 18:39 | 小站托福TPO客户端

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发表于 2018-5-20 10:02 |显示全部楼层
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发表于 2018-5-20 15:05 |显示全部楼层
HANNAH KIWI 发表于 2018-5-17 11:21
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哇,谢谢老师,原来我漏掉了这么多重要的部分
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