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: Fuel-cell engines have several advantages over internal-combustion engines and will probably soon replaces them.
Sub point 1: The fact that fuel-cell engines utilize easily available, renewable resources makes them particularly attractive.
Sub point 2: Hydrogen-based fuel cells are attractive because they will solve many of the world’s pollution problems.
Sub point 3 : People will spend less money to operate a fuel-cell engine than they will to operate an internal-combustion engine.
2. 听力要点概括
Point 1: Hydrogen is not such a practical and easily available substance.
Point 2: Although the cars would not pollute, the factories that generated the hydrogen for the cars would pollute.
Point 3: There won’t necessarily be any cost savings when considering how expensive it is to manufacture the fuel-cell engine.
TPO逐题精讲”能有效帮助您查漏补缺，完美备考。
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