From the first paragraph we know that ______. [br] Professor Harry L. Fisher was

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问题 From the first paragraph we know that ______. [br] Professor Harry L. Fisher was asked to ______.

选项 A、help develop a chemical weapon
B、prepare chemical compounds
C、decide the effect of sulfur
D、test a list of 20 compounds

答案 A

解析细节判断题。Harry L. Fisher在一战中受国防部委托研究一种化学武器，这是最主要的事实。本题中其它的选项要么与事实不符，要么过于琐碎。

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