“Our hope is for somebody who lives in that region to simply be able go in their back yard and grab a handful of cilantro, maybe let it dry out for a couple days sitting on a rock in the sun, and then maybe a handful of that would purify a tank of water，” Mr. Schauer said.

　　He believes dried cilantro could someday be sold like tea bags, or as reusable water filters to heavy metals.

　　81. What is the disadvantage of activated carbon used as a water purifier? (No more than 3 words)

　　________________________________________________________________________

　　82. What is Douglas Schauer by profession? (No more than 3 words)

　　________________________________________________________________________

　　83. Why were ten wild plants tested in the experiment? (No more than 12 words)

　　________________________________________________________________________

　　84. What is the main idea of the passage? (No more than 10 words)

　　________________________________________________________________________

　　Section C (25 marks)

　　Directions: Write an English composition according to the instructions given below in Chinese.

　　请根据下面三幅画的内容写一个小故事，并就此发表你的看法。

　　主要内容包括：

　　1．连环画的内容；

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