考博考试

【单选题】But (as) a historian, Graves should be aware that JamesClerk Maxwell’s brilliant insight about electromagnetism—the guess that visible light is only one small slice of the spectrum of (electromagnetic) energy, a guess that forms the basis (for) electronics technology—(is) an intuitive leap into the unknown.
A．as
B．electromagnetic

C、for
D．is

网考网参考答案：C
网考网解析：
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