You are given only half an hour to finish your speech on the subject, so you'd better not _____ it too far. [ ]

A. expand    

B. extend    

C. enlarge  

D. increase

4个月男孩，冬季出生；足月顺产，单纯牛奶喂养，近10天来烦躁，多汗，夜间睡眠不好。

首先考虑的诊断（）

A.佝偻病

B.缺铁

C.缺锌

D.血磷高

E.维生素A缺乏