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单项选择题,每题20分,60分算你过关,答案下期公布。你可以将自己的答案寄给本刊编辑部,前5位满分者将各获得下期杂志一本;你还可
Single choice, each question 20 points, 60 points you pass, the next announcement. You can send your own answers to the editorial department of this magazine, the top 5 scorers will each get a copy of the next issue of the magazine; you can also