小儿“四病”是什么？（）
A.贫血
B.佝偻病
C.肺炎
D.腹泻
E.龋齿
参考答案：A, B, C, D
When I was walking down the street, I saw a plane _____ over my head. [ ]
A. flying
B. to fly
C. flew
D. flies
先天性心脏病患儿在应用洋地黄类药物时应如何护理?
