单选题
Whether______is an Englishman, a Frenchman, or a German is a matter of no real importance. His discoveries are open to all, and nothing but intelligence is required in order to profit by them.
【正确答案】
A
【答案解析】[解题指要] 这里要填入的是“一个科学家”，正确用法为a man of science。类似表达有：the an of painting(绘画艺术)，故A选项正确。