In the lecture, the professor points out that the hypothesis made by the reading passage is not adequate to explain why the Mayan civilization disappeared. He points out several weaknesses of the statements made by the reading passage.First, the professor claims unreasonable the reading statements that the Mayan culture vanished due to their inability to cope with droughts. In fact, he argues that it was not th 登录查看全部内容
第2题来源：北美话题分类：Natural Phenomenon属性：大范围重点预测
话题
关于金星发出金黄色光芒的三大理由是否具有说服力。
阅读要点
Reading: Venus上有yellow or golden light被称为Ashen Light，文章解释了3个原因
a) 是Venus和Sun的紫外线radiation作用，氧原子变成氧分子，这个过程产生黄光
b) 是Venus的day side的storm中不规律的flash
c) 是观察的设备或天气原因，可能这现象压根就是幻象
听力要点
Listening: 这个现象是real phenomenon, 不是幻象
a)这个过程发出的是绿光，instead of yellow or golden light
b)Venus的day side是对着太阳的，但这个现象是被观察到在dark side的，所以不是storm引发的。
c)不同的观察者在不同的时间不同的地点用不同的设备看到的，所以不能说是instruments or weather 的faulty
范文
None of the three hypotheses in the reading can exactly explain the existence of Ashen Light in the Venus.
Firstly, from the perspective of the interaction with the ultraviolet, the professor states his doubt, because according to the lecture, in the action of the ultraviolet, when the oxygen is transformed from ato 登录查看全部内容
The listening and the reading both discuss three ways of tackling lionfish’s expansion from Indian Ocean to Pacific Ocean. However, what the reading suggest is quite different from the main idea in the listening.
First, in the reading, it’s said that the migrated lionfish should be captured by human to protect the coral reef system. In contrast, the professor holds a different view that many people cannot distinguish lionfish from other fishes. Moreover, many rare fishes also live 登录查看全部内容
第5题来源：北美话题分类：Environment属性：大范围重点预测
话题
【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.
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