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全新题型【学术讨论写作】
5-18岁的学生参加outdoor classes好不好?
你喜欢在早上还是晚上学习?
Some students prefer to study for exams in the morning. Other students prefer to study in the evening. Which do you prefer? Explain why?
2024.11.13托福综合口写考题回忆:
综合写作:
Using bacteria to clean up oil spills
1. 细菌生物入侵
One of the critics' concerns is that a bacterial population, dramatically increased by feeding on an oil spill, will stay in the area after the spill is cleaned up. The bacteria could come to dominate the area, competing with native plants and animals for food and sunlight. The negative environmental effects of this could be significant.
Second, bacteria at the oil spill site must be given extra nutrients (such as nitrogen and phosphorus) in order to grow, reproduce, and do their job at an efficient rate. The problem is that the extra nutrients can leak outside of the area affected by the spill, and they may attract and feed other marine organisms. This can result in extremely rapid population growth among the other organisms, upsetting the balance of marine ecosystems near the spill.
Third, if oil-transporting companies start to believe bacteria can cheaply and efficiently clean up oil spills, they might start to pay less attention to spill prevention. This could lead to spills becoming more frequent. More frequent spills could cause lasting environmental damage because some harmful oil components are too complex for the bacteria to break down, and these components remain in the ocean even after a bacterial cleanup.
Task 2
Task 3
科学家追踪动物的方法
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