918综合 In the lecture, the speaker states that the reasons for the decline haven’t been found , casting doubt on the main idea of the reading passage that several hypotheses lead to this decline To begin with, the speaker makes the point that healthy yellow cedars can insect infestation. which refutes the viewpoint showed in the article that the decline may be caused by insect parasites.. According to the speaker, the powerful chemicals of yellow cedar are poisonous to insects, and the healthy cedars can suffer from the insect. This directly contradicts what the reading passage indicates. Moreover, the author claims that the decline to brown bears.whereas the speaker views this issue in a different angle. In accordance with the speaker, there were no bears on the island,).This is another part where the speaker disagrees with the writer. Finally, the speaker challenges the writer’s expectation again by saying that the climate is not the reason for the decline of the trees. On the contrary, the writer insists that the changes of climate lead to the decline. In order to demonstrate his/her perspective, the lecturer provides us with the evidence that more trees are disappear in the warm place. To sum up, the contents in the reading passage are totally jeopardized by the speaker and the speaker has totally different ideas on the topics made in the reading.
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发表于 2012-9-18 21:53:18
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