Toefl作文
2016-02-28 14:50
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模板一:The listening content says the Sauropod neck bone structure is positioned in a vertical arrangement, which is contrary to the reading that says it is horizontally arranged for being able to support it without difficulties.
Firstly, the speaker mentions the valves and the pneumatic structure in the neck, which means valves can be sure to prevent blood sliding back to the heart and there are air sacs that make the neck bones not as heavy as we think, so those are reasons to support the heavy neck; however, the reading says the fossil being re-constructed is arranged horizontally.
Secondly, according to the lecturer, the function of heart is evolved for elongated neck. That is to say, with strong heart function, it was able to pump up the blood with higher energy to the neck as well as the head, just like ostrich mentioned in the listening. The long neck structure will not cause problems. This likewise refutes the author in that the blood transmission to the head and the neck is impossible.
Thirdly, the listening content indicates that the structure of the long neck is naturally designed, and it means that in the food chain, various creeatures are responsible for different part of the—tree. In addition, the lower section of the tree is the food source of a variety of creatures which is too competitive. Nevertheless, the reading says it takes too much energy to reach food in the higher position of the tree. In summary, the speaker thinks that the anatomy in the Sauropod’s neck should be built vertically and it holds a different stand from what the reading explains.
模板二:
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