题目内容：

(2017·北京完形改编) They saw a man eating out of a garbage can. She asked her mother why he did that and her mother said that the man was homeless and hungry. Hannah was very             . She couldn’t understand why some people had to live their lives without shelter or enough food. Hannah started to think about how she could help, but, of course, there is not a lot one five-year-old can do to solve(解决)the problem of homelessness.

A. annoyed     B. nervous   C. ashamed    D. upset