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包子不包子

7.8综合

The reading passage raises the issues that the yellow cedar is decreasing since about 1880 for three main reasons.The professor refutes that the claims are not adequate by providing further different evidence.

The speaker mentions that the healty cedars are more resistant to the insect infestation than other species,because their leaves and tree barks are saturated with poisonous chemicals.The reason why the record in the reading for beetles attack is that the beetles attacks the trees which are already damaged and sick,which are likely to be dead.According to his statement,the beetles are not the fundamental factor for the decrease of the trees.

The next view made by the professor is that the dropping exists all over the northwestern coastline of the United States,including both the mainland and the island.What needs to be pointed is that on the island,the Cedar's population still decreased withou bear living.The above evidence shows that the bear is also not the key factor.

The speaker also demurs the third hypothesis by declaring that an important fact is missing in the reading.The decreas is more seriously in the low elevation areas than the high elevation ones .What's more ,the temperature in the low elevation is warm,while in high elevation is cold.This indicates that the root systems are not sensitive in cold weather.If not,the trees would die more in the high elevation places.

可以适当提携阅读中的观点 对照比较起来逻辑更清楚
蛮好的了 小问题 标点后要加空格哈