题目

The first use of atomic weapons was in 1945. and their power ______ increased enormously eversince. A. is        B. was      C. has been      D. had been 答案：C下列事件按时间的先后顺序排列正确的是（ ）①阿保机称帝 ②赵匡胤建立北宋 ③澶渊之盟 ④宋夏和议 ⑤西夏建立A. ①②③⑤④ B. ②④⑤③①C. ①②⑤④③ D. ②①③⑤④