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[Omar~Omar老师已改] 托福写作——[综合+独立][tpo23]麻烦老师啦~

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发表于 2018-7-5 10:54 |显示全部楼层
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Question:Summarize the points made in the lecture you just heard, explaining how they cast doubt points made in the reading passage.Population of the yellow cedar have been steadily declining for more than a century. Scientists have found many reasons to explain this phenomenon.
The first reason that the reading material says is that insect parasites, espacially the cedar bark beetles. However the listening argue that the cedar beetles can\\\'t be the reason. The beetles only attack dameged or sick yellow cedars but there are still healthy cedars which were died. So if the beetles cause the decline, the healthy cedars are unlikely to suffer.
The second reason in the reading material is bears. Bears aggressive feeding habits may weaken trees. But in the listening material, there are two kind of space where the yellow cedars grow. One is the mainland and the other is island. It turns out there is no bear on the islands, so if the fundamental cause is the attack of bears, how to explain the decline of cedars on the island where no bear exists? So it is apparently not bears\\\' bad.
The last reason is that the phenomenon may be caused by the gradual changes of climate. The changing climate may affects the growing roots and undermine the health of the whole tree and eventually kill it. It is argued in the listening material that if it is because of the climate so the dying cedars in  low temperature in high elevation will increase. However, the fact is totally different, the cedars grow in high temperature in low elevation are more likely to die. So it is apparently not caused by the change of climate.


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