北大2000博士入学英语考试的几道题

以下是北大2000博士入学英语考试的几道题，如果没拼写错误就是这样了。请问各位高手这些题难度如何？我觉得太难了，甚至难的都觉得有些句子是错的，还是求助高手吧！谢谢！

The appeal to the senses known as ______ is especially common in poetry.
A. imaginative B. imaginable C. ingenious D. imagery
问题难点：整句意思？

The retired engineer plunked down $50,000 in cash for a mid-size Mercedes as present for his wife ______ a purchase with money made in the stock market before.
A. paid off B.paid through C.paid out D.paid for
问题难点：句子结构？

Danis Hayes raised the essential paradox and asked how people could have fought so hard against environmental degradation ______ themselves now on the verge of losing the war.
A. only found B. finding only C.only to find D.have only find
问题难点：整句意思？

If there is the need to compete in a crowd, to battle _____ the edge the surest strategy is to develop the unexpected.
A. on B. for c. against D. with
问题难点：“to battle _____ the edge the surest strategy is to develop the unexpected”语法分析？

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