教授讲了risk of price discounting。 第一这样会导致大家停止购买正常价格的商品。举了一个家具公司的例子，他们在12月有个非常大的促销，几乎所有的商品都打折。过了几年，公司发现顾客在一年其他时间不买他们的商品，就等12月打折时候买。另外一个risk是大家会认为打折商品质量就比较差。举了汽车公司的例子。为了促销新款汽车，打折了。然后顾客就会怀疑是不是因为零件有问题，质量差才打折
解题思路
讲座关于产品打折可能造成的两种风险。
范文
The lecture has discussed two risks of price discounting. First of all, it will prevent the customers from buying products with normal price. The professors talked about an example of a furniture company. There will be an annual discount season of 登录查看全部内容
第2题来源：大陆话题分类：Animal属性：大范围重点预测
话题
讲座关于水流湍急的河中的鱼群面临的两个挑战以及解决方法。
听力要点
Lecture: fast current 的河里面的鱼遇到challenge， 第一，水流太快，无法停留在一个地方，会被水流冲下去。 catfish，有着big和muscular的fin（鱼鳍） 可以swim against水流，第二，水流太快，携带的食物无法吃到。 另一种鱼trout有一种behavior可以解决这个问题。 一般来说河流中间的水最快，但是岸边的水慢，trout就一直在岸边附近，这样就能吃到。
范文
The professor uses two examples to demonstrate the ways for fish in the river with fast current to cope with problems. The first problem for fish living in the environment is to avoid being washed away by the fast current. He mentio 登录查看全部内容
第3题来源：北美话题分类：Animal属性：大范围重点预测
话题
动物适应环境，为了跑得更快，进化出了独有的特征。
听力要点
1. The type of adaption that enables animal to run fast 1.Special feet-a pad underneath the feet-able to run on rough surface and avoid hot sticks. E.g. Cheetah
2. Large long legs.-muscular muscle around the leg sending the body forward. Also, long legs enable Cheetah to travel long distance within short time
3.
范文
In the lecture, the professor talks about two types of adaption that enables animal to run fast The first adaption is that some of animals have special feet, which enables animal 登录查看全部内容
第4题来源：大陆话题分类：Social Problem属性：大范围重点预测
话题
关于19世纪后期读报纸的人比过去多的两个原因。
听力要点
Lecture: Late 19th的读报纸的人比过去多因为两个原因：原因1、advance in technology, e.g. better printing devises and printing process faster, so the amount of newspapers is increasing。原因2、publishers base their fund more heavily on the advertisements, so the cause of publishing newspapers is less.
范文
The lecture is talking about the reasons that more people in late 19th read newspaper than before. One reason is the advance in technology. For example, the printing devices were improved and printing process was faster, so the amou 登录查看全部内容
Scarcity is the economic problem of having seemingly unlimited human wants in a world of limited resources. It states that society has insufficient productive resources to fulfill all human wants and needs. In the lecture t 登录查看全部内容
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