Reading: mercury牙医用来repair牙齿的一种物质。阅读说应该被禁止。 1. 影响健康。里面有种物质吸收后会影响central nerve system带来一系列病。 2.环境问题。诊所里用完后冲走进入江河湖海，会造成环境污染威胁wildlife。 3. 可以代替的材料。有很多材料可以代替她，像陶瓷，金什么的。 Listening: 反对： 1. 它只有很少的量被人体吸收。不会带来什么大问题。有些人有问题是他们过敏，然后这种过敏的比例很小。 2. 有一种device, S开头的，）（屏幕会显示。）可以COLLECT这些solids所以不会带来这些问题。 3. 这种材料持续时间长效果好，其他材料不能代替。像金。太贵了。
The reading passage expresses the idea that Mercury, which is a kind of substance used by dentist to repair teeth, should be banned. There are three reasons. First, Mercury is harmful to individuals’ health because it may affect central nerve system if absorbed by human bodies, causing a series of diseases. The second reason is about environmental issues. The Mercury used in clinics is disposed of down drains, which may pollute the environment and threat wildlife. Finally, substitutes for mercury can be easily found. Many types of materials, like porcelain or gold, can replace it. However, the opinions in the reading section are strongly refuted by the listening section. To begin with, Mercury does not have detrimental effects to human health because only an extremely small amount of Mercury can be absorbed by human, which means that it may not result in serious consequences. In some cases, patients are allergic to this substance, but the percentage is very small. In addition, the environmental problems can be avoided if a newly-developed device, namely S开头的专有名词, is used to collect the solids before they are washed off. Third, although there are several substitutes, this substance has its own unique benefits-it is more effective and lasts for a long time. By comparison, other materials, like gold, are too pricy.
