tpo23综合写作求拍砖

monica54UID: 2614280

马上就考托了，综合写作练手一篇，求批，愿意互改的把链接贴上，必回应，多谢

The lecturer think the reason provide in the reading is inadequate to explain why the yellow cedar decline.

First, the lecturer believes the insect parasites only attack the trees not healthy enough since these trees are not resistant to the parasites. So it is not a sufficient explanation that insect parasite causes the decline of the yellow cedar.

Secondly, in the lecture, the professor point out that on some island, yellow cedar decline as well while there is no bear on it. If the yellow cedar declines no matter whether it is with or without bears, then the bears mentioned in the reading material cannot be blame on.

Thirdly, the lecturer cast doubt on the reason provided in material that yellow cedar declines since the roots of yellow cedar are damaged by the cold weather. According to the lecture, yellow cedars planted in the low elevation, where is warmer, die more than those in the high elevation. Thus, yellow cedars’ decline are not due to the cold weather, while the climate change may relate to the number of yellow cedars.

In conclusion, the lecturer disagree on the explanation provided in the reading material.

monica54UID: 2614280

贴一下阅读材料
Populations of the yellow cedar, a species of tree that is common in northwestern North America, have been steadily declining for more than a century now, since about 1880. Scientists have advanced several hypotheses to explain this decline.
One hypothesis is that the yellow cedar decline may be caused by insect parasites, specifically the cedar bark beetle. This beetle is known to attack cedar trees; the beetle larvae eat the wood. There have been recorded instances of sustained beetle attacks overwhelming and killing yellow cedars, so this insect is a good candidate for the cause of the tree’s decline.
A second hypothesis attributes the decline to brown bears. Bears sometimes claw at the cedars in order to eat the tree bark, which has a high sugar content. In fact, the cedar bark can contain as much sugar as the wild berries that are a staple of the bears’ diet. Although the bears’ clawing is unlikely to destroy trees by itself, their aggressive feeding habits may critically weaken enough trees to be responsible for the decline.
The third hypothesis states that gradual changes of climate may be to blame. Over the last hundred years, the patterns of seasonal as well as day-to-day temperatures have changed in northwestern North America. These changes have affected the root systems of the yellow cedar trees: the fine surface roots now start growing in the late winter rather than in the early spring. The change in the timing of root growth may have significant consequences. Growing roots are sensitive and are therefore likely to suffer damage from partial freezing on cold winter nights. This frozen root damage may be capable of undermining the health of the whole tree, eventually killing it.

庄严肃穆UID: 3207086

楼主应该往300+写。。。

monica54UID: 2614280

综合作文不是150-225吗？写300+好吗？ 3# 庄严肃穆

monica54UID: 2614280

自己顶一个。。。