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[HANNAH KIWI老师已改] 托福写作——[综合][TPO26] 求老师批改,谢谢老师!!!

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发表于 2018-5-15 14:38 |显示全部楼层
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[passage]:
In the passage, the author believes that the invasion of zebra mussels cannot be stopped and is a serious threat to the freshwater fish population in North America, whereas the professor in the lecture refutes its ideas.
For the first reason presented in the passage, it is said that the zebra mussel's spread might be unstoppable. However, from the professor's point of view, that zebra mussels cannot be stopped is only because people do not have enough knowledge in the past. People now know that they can refill the ballast water with ocean water to kill the zebra mussels in order to stop the zebra mussels from spreading.
Second, the author in the passage reckons that zebra mussels can dominate a new habitat once they are carried to it because they have a high rate of reproduction and have no natural predators. The professor refutes this point by showing the fact that they do have predators and their predators are birds. Once the birds notice there is a new food source, they can change their habits to eat zebra mussels and they can eat a lot of zebra mussels actually.
Finally, in the author's opinion, there is likely to be a decline in the overall fish population in habitats where the zebra mussels become dominant. However, the professors believe that zebra mussels can only influence part of the fishes' population. Zebra mussels can produce nutrient which can be eaten by some bottom-feeding fishes, whose population would rise accordingly.


Once you eliminate all the impossible, whatever remains, no matter how inprobabe, must be the truth.
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发表于 2018-5-16 09:37 | 小站托福TPO客户端

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发表于 2018-5-16 18:28 | 小站托福TPO客户端

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