题目

Henry was away from home for quite a bit and _______ saw his family. A . frequently B . seldom C . always D . usually 答案：B20．康熙、雍正、乾隆统治时期，一方面社会安定、经侪繁荣、国力强盛，另一方面却潜藏着巨大的危机，“危机”的表现主要有（　　）①文化专制达到顶峰②压制打击工商业③鄙薄科学技术④白银大量外流．A．①②③B．①②④C．①③④D．②③④