In 1915 Einstein made a trip to Gottingen to give some lectures at the invit

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问题 In 1915 Einstein made a trip to Gottingen to give some lectures at the invitation of the mathematical physicist David Hilbert. He was particularly eager to explain all the intricacies of relativity to him. The visit was a triumph, and he said to a friend excitedly, "I was able to【C1】______Hilbert of the general theory of relativity."
Amid all of Einstein’s personal turmoil(焦躁)at the time, a new scientific【C2】______was about to emerge. He was struggling to find the right equations that would【C3】______his new concept of gravity, ones that would define how objects move through space and how space is curved by objects. By the end of the summer, he realized the mathematical approach he had been【C4】______for almost three years was flawed. And now there was a【C5】______pressure. Einstein discovered to his【C6】______that Hilbert had taken what he had learned from Einstein’s lectures and was racing to come up with the correct equations first.
It was an enormously【C7】______task. Although Einstein was the better physicist, Hilbert was the better mathematician. So in October 1915 Einstein threw himself into a month-long frantic【C8】______in which he returned to an earlier mathematical strategy and wrestled with equations, proofs, corrections and updates that he rushed to give as lectures to Berlin’s Prussian Academy of Sciences on four【C9】______Thursdays.
His first lecture was delivered on Nov. 4, 1915, and it explained his new approach, though he admitted he did not yet have the precise mathematical formulation of it. Einstein also took time off from【C10】______revising his equations to engage in an awkward fandango(方丹戈双人舞)with his competitor Hilbert.
A)extinction B)describe C)furiously D)complex
E)repetitive F)anxiety G)contending H)competitive
I)convince J)successive K)endeavor L)darted
M)horror N)coarsely O)pursuing [br] 【C7】

选项

答案 D

解析空格位于副词与名词之间，应填入形容词或分词。句首的it指代上文提到的“找到正确的方程式”。上文提到爱因斯坦发现自己苦苦探求了将近三年的数学方法存在缺陷，可见此任务很艰巨，极为复杂。complex符合语境。

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