【题目】coal ash的污染很严重，需不需要new much stricter regulations on handling and storing coal ash。
阅读要点
【阅读】说不需要，有几个理由。
1. 相关的regulation已经存在，要求company to use LINER on the ponds什么的。
2. 他怕新的严格的规定，会让人们不敢再买recycled coal ash。
3. increasing cost. 电费会涨十倍，大众会不接受。
听力要点
【听力】认为需要。
1. 原本的规定只要求company在新的ponds上用liner，old ones are not required。所以现在old ponds还是会产生许多coal ash， 会进入地下水，最后污染饮用水。
2. professor举了mercury的例子：在mercury 的问题上也有很严格的regulation, 但是人们依然在买recycled mercury for over 50 years。
3. 电费确实会涨到多少billion，但是平均到人头上，每个人的电费就只涨了1%而已。It is not a big price to pay to have a cleaner environment.
第3题来源：北美话题分类：Biology属性：大范围重点预测
话题
【题目】飞蛾扑火的三个说法是否正确。moth飞蛾，总是围绕人造（human made lights）灯光的地方甚至crush into lights。
【阅读】Three ways to avoid space debris from colliding with spaceships.
1. Tracking technology;
2. Spaceship shield;
3. Laser broom.
听力要点
【听力】The professor is against three methods:
1. Tracking technology will only track bigger debris. Small debris travel fast and collision caused them are fatal. E.g. a chip of paint from one spaceship collided with another spaceship. The small debris smashed on another spaceship’s wall and created a hole.
2. Shield method is not good too since it adds extra weight to the spaceship. We need to develop more powerful rocket to deliver the spaceship to the space. The challenge is harder for us.
3. Finally, the professor doesn’t like laser broom idea. A laser broom with such power could be used a military weapon in space, which violates the international agreement.
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