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  3. George Washington Carver showed that plant life was more than just food for animals and humans. Carver’s first step was to analy

George Washington Carver showed that plant life was more than just food for animals and humans. Carver’s first step was to analy

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问题     George Washington Carver showed that plant life was more than just food for animals and humans. Carver’s first step was to analyze plant parts to find out what they were made of. He then combined these simpler isolated substances with other substances to create new products.
    The branch of chemistry that studies and finds ways to use raw materials from farm products to make industrial products is called chemurgy. Carver was one of the first and greatest chemurgists of all time. Today the science of chemurgy is better known as the science of synthetics. Each day people depend on and use synthetic materials made from raw materials. All his life Carver battled against the disposal of waste materials, and warned of the growing need to develop substitutes for the natural substances being used up by humans. Carver never cared about getting credit for the new products he created. He never tried to patent his discoveries or get wealthy from them. He turned down many offers to leave Tuskegee Institute to become a rich scientist in private industry. Thomas Edison, inventor of the electric light, offered him a laboratory in Detroit to carry out food research. When the United States government made him a collaborator in the Mycology and Plant Disease Survey of the Department of Agriculture, he accepted the position with the understanding that he wouldn’t have to leave Tuskegee. An authority on plant diseases-especially of the fungus variety--carver sent hundreds of specimens to the United States Department of Agriculture. At the peak of his career, Carver’s fame and influence were known on every continent.
Carver battled all his life against the disposal of waste materials, and proposed that substitute be developed to______.
选项
答案replace natural substances being used up by humans
解析 通过阅读原文从字里行间找答案。本题的答案可从原文中找出来，但并不能完全照抄原文，而要做一些小的变动。原文中用介词for，问题回答时，就要改为to replace。如果用take the place of就多用了单词。
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