加强思想控制的措施秦朝（）、西汉罢黜百家独尊儒术、明朝八股取士、清朝大兴文字狱。
参考答案：焚书坑儒
It is the first time I _____ visitors since I moved to London.[ ]
A. had had
B. have had
C. have
D. had
营养性缺铁性贫血的正确预防措施是（）
A．提倡鲜牛奶喂养
B．提倡母乳喂养
C．多补充维生素B12
D．早产儿需早补锌
E．婴儿奶粉应强化钙剂
