摘要：3.10/3.11托福考试考后回忆---写作部分 3.10 综合写作 重复2016年1月9日 阅读部分： 是否应该禁止牙医使用汞合金来补牙 Amalgam should be prohibited in dental repairs 1) 对人体有害，long period of tim
是否应该禁止牙医使用汞合金来补牙 Amalgam should be prohibited in dental repairs
1) 对人体有害，long period of time 之后会进入人体 nervous system 带来一系列的疾病
1) First, the recent study shows that with a small amount of mercury, human body will not be harmed. Those people who are affected significantly as reading mentioned are allergic.
2) Second, most of dentists have a separator in their offices, a kind of filter which can collect solid materials and prevent water with mercury from flowing into sewer systems to pollute body of water.
3) Third, mercury has lots of advantages. It can last longer than other materials in human’s wet mouth. Also, gold is expensive. It can increase cost of dental by 12 billion dollars every year.
Which one is the most important factor to help you work productively:
a) having an environment free of noise and distractions;
b) knowing that you will receive a reward;
c) doing something you are interested in.
People can solve important problems by themselves or with thehelp from their family members so there's no need for the government to helpthem.