2. 外语
  3. How do we know if our food is safe? What about the medicine we take? What happens when a problem with our air or water is 【S1】__

How do we know if our food is safe? What about the medicine we take? What happens when a problem with our air or water is 【S1】__

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问题     How do we know if our food is safe? What about the medicine we take? What happens when a problem with our air or water is 【S1】______? Federal, state, and local governments make rules for the 【S2】______ of the public. In order to make sure these roles are followed, all levels of government hire people to do 【S3】______. Let’s look at one type of federal health and regulatory inspectors.
    Oil spills, global warming, and water pollution are 【S4】______ issues we hear of quite often. How do we protect our environment? The Environmental Protection Agency(EPA) oversees the 【S5】______ of our environment. The EPA is an independent government agency that reports directly to the President of the United States. EPA inspectors are involved in pollution control to 【S6】______ our air and water are clean and safe. They promote recycling and work to assure that garbage is disposed of 【S7】______. They inspect the cleanliness of hospitals, restaurants, and industries to promote 【S8】______ safety. EPA inspectors are called in to 【S9】______ environmental disasters such as oil spills or improper hazardous waste disposal. Inspectors at this agency do ongoing research on the ozone layer, global warming, and other environmental changes. The environment we live in is important to our health. The job of the 【S10】______ at the EPA is to keep our environment clean.

               Word Bank:
A. cleanliness            I. environmental
B. ensure                 J. experiments
C. inspections            K. safety
D. established            L. protectors
E. properly               M. quickly
F. efficient              N. social
G. investigate            O. discovered
H. inspectors
选项
答案O
解析 从语法结构看，这里缺少表语成分，选项中能在句中作表语的单词有D.established、F.efficient、I.environmental、N.social 和O.discovered。从句意看，该句表达如果我们的空气和水出现了问题，会发生什么情况。这些选项中能够顺应此意并能与problem 一词搭配使用的只有discovered。
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大学英语四级

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