题目内容：

第三节 单句改错 (共5小题；每小题1分，满分5分)

1.Struggled in a world of silence and darkness.，Helen Keller seemed to be simple-minded.

2.The three Bronte sisters adopted this practice.，Mary Ann Evans did the same.

3.We decided to fight against this unfair system which prohibits us blacks sitting where we like.

4.Our friendship had developed quickly over the weeks that followed.

5.Maybe if I studied science then, I would have been able to give more help.