摘要:第一节 单项填空(共15小题,每小题1分.满分15分) 从A.B.C.D四个选项中.选出可以填入空白处的最佳选项.21. from space, the earth, with water seventy percent of its percentage, looks a “blue ball . A. Seen; covered B. Seeing; covering C. Seeing; covered D. Seen; covering

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