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  3. When were the chemicals first used in America?

When were the chemicals first used in America?

admin2015-03-11  47
问题 When were the chemicals first used in America?
选项 A、Before the American Revolution.
B、Over thirty years ago.
C、Over two hundred years ago.
D、Before the discovery of potassium nitrate.
答案A
解析 细节题。文中指出早在美国独立战争开始之前，欧洲人就开始(在美国这片殖民地上)使用化学肥料了。故选A。
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