问题 选择题 世界上最早的纸币“交子”出现于 [ ]A、隋朝 B、唐朝 C、北宋 D、明朝 答案 C 选择题 I'm not surprised that he became a writer. Even as a child he had a(n) __________imagination. [ ]A. clear B. elegant C. funny D. vivid 查看答案 单项选择题 入罐进行油气浓度检测人员应配戴（）和着整套防护服装才能进入，罐外还应配专人监护。A.面具B.防毒面具C.供气呼吸器D.手帕 查看答案
