问题补充：
Ann is only two years old, so we should her.
A. look at
B. look for
C. look after
D. look out
答案：
A. look at
B. look for
(答案→)C. look after
D. look out
解析：
试题分析: 句意：安只有两岁，所以我们应该照顾她。look at看，look for寻找，look after照顾，look out当心。根据Ann is only two years old安只有两岁，可知选C.
