TPO (TOEFL Practice Online) 是美国教育考试服务中心(Educational Testing Service，简称ETS)专为参加
1. 阅读要点概括：
Theme:
The unstoppable invasion from ZM will lead to serious impact on native fish
Key point 1:
Owing to ships, ZM will quickly take over all the habitats in North America
Key point 2:
ZM can dominate the new habitats thanks to high productivity and no predators
Key point 3:
ZM’s competition on food with native fish species will lead to decline in fish population
2. 听力要点概括：
Theme:
Ways to control, not clear
Key words 1:
Enough knowledge, stop, empty out the freshwater, refill with ocean water, saltwater, kill
Key words 2:
Beginning, birds, notice, new food source, change, eat a lot
Key words 3:
Overall population, decrease, other fish, positive impact, generate nutrients, increase
TPO逐题精讲”能有效帮助您查漏补缺，完美备考。
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