81. It is costly.　细节理解题。根据第二段可知活性炭用作饮用水重金属除却剂时，不足之处是价格太贵。

　　82. A teacher.　推理判断题。根据Douglas Schauer at Ivy Tech Community College in Lafayette, Indiana led a few of his students to the Tula Valley可以判断Douglas Schauer先生的职业是教师。

　　83. To find out which plant was the most effective water purifier.　细节理解题。根据倒数第四段最后一句可知研究人员测试10种野生植物是为了弄清楚哪一种植物去除水中的重金属最有效。

　　84. Cilantro may help make the water cleaner and safer./Cilantro may help remove heavy metals in water./ Cilantro may be used as a water purifier.　主旨大意题。本文主要介绍了一个最新的科学发现：香菜可以去除水中的重金属，净化水源。

　　One possible version：

　　One day a two­year­old boy called Doudou is playing in a park with his parents. After a while he feels thirsty so he asks his mother for a bottle of water. Having drunken up the water, the boy walks towards a nearby dustbin with the empty bottle in his hand. Unfortunately he falls over an iron chain. The boy doesn't cry. Instead, he crawls on and manages to throw the bottle into the dustbin.

　　I am deeply touched. What an eco­friendly boy he is! Of course the boy may not be aware that he is protecting the environment. He learns from examples. So as adults, we should mind our manners and set a good example to children. On the other hand, now that a two­year­old boy can learn to protect the environment, why can't adults? If everybody contributes a little to preserving the earth, the earth will become cleaner and better.

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