When were the chemicals first used in America?A、Before the American Revolution.

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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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