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,并在答题卡上将该项涂黑. 21. It’s quite obvious that the aging population in China will cause heavy pressure on whole society in the future. A. a; / B. /; / C. a; the D. the; a

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