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一、选择题(本大题共10小题,每小题5分,共50分.在每小题给出的4个选项中,恰有一项是符合题目要求的)
A multiple-choice questions (the big problem a total of 10 small problems, each small problem 5 points, a total of 50. In each small question given four options, exactly one is in line with the requirements of the title)