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
Main point:
The pollution hypothesis can better explain the decline of sea otter
Sub point 1:
The increased levels of chemicals in water indirectly killed sea otters
Sub point 2:
It was not orca but pollution that led to the decline in other sea mammals’ population
Sub point 3:
Uneven concentrations of pollutions caused the uneven pattern of otter decline
2. 听力要点概括
Point 1: Find no dead sea otter, beaches, expect; consistent with, eaten
Point 2: Orcas, whales, disappeared, human hunters; change, only smaller sea mammals
Point 3: Uneven pattern, accessible, large, shallow or rocky locations, populations, not declined
TPO逐题精讲”能有效帮助您查漏补缺，完美备考。
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