题目

Were you the first or the last child in your family? Or were you a middle or an only child? Some people think ___41___ matters where you were born in your family. But there are different ideas about what birth order means. Some people say that oldest children, ___42___ are smart and strong-willed(意志坚强的), are very likely ___43___ (succeed). The reason ___44___ this is simple. Parents have a lot of time for their first child and give him or her a lot of attention. An only child will succeed for ___45___ same reason. What happens to the ___46___ children in the family? Middle c某博物馆藏有一柄古代铁剑，为防止其生锈，下列做法合理的是A. 定期用清水冲洗，除去灰尘 B. 放于体验区，让观众触摸C. 用盐水除去铁剑上的锈斑 D. 放在充满氮气的展览柜中