2. 外语
  3. George Washington Carver showed that plant life was more than just food for animals and humans. Carver’s first step was to【S1】__

George Washington Carver showed that plant life was more than just food for animals and humans. Carver’s first step was to【S1】__

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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【S1】______plant parts to find out what they were made of. He then combined these【S2】______isolated substance with other substances to create new products.
    The branch of chemistry that studies and finds ways to use raw【S3】______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【S4】______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【S5】______substances being used up by humans.
    Carver never cared about getting credit for the new products he created. He【S6】______tried to patent(获取专利)his discoveries or get wealthy from them. He turned down offers to leave Tuskegee Institute to become a【S7】______scientist in a private industry. Thomas Edison, inventor of the electric light, once offered him a laboratory in Detroit to carry out food【S8】______. Later, he became【S9】______of the Mycology and Plant Disease Survey of the Department of Agriculture. At the peak of his career, Carver’s【S10】______and influence were known on every continent.

A)depend                                                I)research
B)always                                                J)materials
C)director                                              K)complex
D)factory                                               L)natural
E)simpler                                               M)analyze
F)never                                                 N)wealthy
G)fame                                                  O)compounds
H)farmer
【S5】
选项
答案L
解析 考查形容词的用法。句法分析显示这里缺少定语，即：形容词；语境的意思为：“研制天然物质的替代品”。据此，我们可以看出[L]natural符合题意。
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大学英语四级

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