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托福综合写作优秀作文练习题：黄杉数量正在减少

2015-04-06 09:16:00来源：网络

　　托福综合写作听力笔记：

　　Main point: 三个假说都不成立

　　Sub point one: 杉皮甲虫不能侵蚀健康树木，可以侵害的树木本身就已经有问题

　　Sub point two: 在没有棕熊的岛屿上黄杉数量也减少了，所以不是棕熊造成的

　　Sub point three: 因为气温高的地海拔地区死亡的多，气温低的高海拔地区死亡的少，因此低温损害说不成立。

　　托福综合写作范文(仅供参考)：

　　In the lecture, the professor points outthat the hypothesis made by the reading passage is not adequate to explain whythe population of Yellow Cedar is on the decline. He points out several weaknessesof the statements made by the reading passage.

　　On one hand, the professor claims thatinsect parasite may not be the fundamental cause of the decline. In fact, heargues that healthy yellow cedar can secrete chemicals which can kill the cedarbark beetles so that they are unlikely to suffer from insect parasite. Thetrees that suffers insect parasite have already been sick or on the edge ofdeath.

　　On the other hand, the professor assertsthat brown bears cannot cause overall decline in yellow cedar population. Thereis decline both on the mainland of North America and islands along the coast.However, there is no brown bear on the islands at all.

　　What’s more, the professor doubts thehypothesis that the change of climate is to blame for the declination. Headmits that the climate has changed rapidly recently. And, if the climatechange is the real cause, the number of trees died on the higher elevationshould be larger than that on a lower elevation. The fact is, however, on theopposite.


本文关键字: 托福综合写作 托福写作 托福作文

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