Many years ago，when I was working as a volunteer(志愿者)at a hospital, I got to know a little gir

小题1:B

小题2:B

小题3:A

小题4:D

试题分析：本文讲述一个生病严重的小女孩只有在输入弟弟的一部分血液之后才能活下来。而他的弟弟认为是会把自己的越野全部输给姐姐，却也同意了这个做法。这件事请让作者感动，因此记忆深刻。

小题1:细节理解题。根据文章第一段第三行The only chance to save her seemed to be a blood transfusion (输血)from her five-year-old brother.“唯一的机会似乎就是从他五岁的弟弟那里输血。”因此答案为B，这个小女孩从他弟弟那里得到抗体会好起来。

小题2:细节理解题。根据文章第二段第一句话The doctor talked to the little boy about what they planned to do, and asked him if he would be willing(愿意的)to give his blood to his sister.“医生和这个小男孩谈论他们的计划，并问他是否愿意给他的姐姐一部分自己的血液。”故答案为B。

小题3:细节理解题。根据文章最后一句话He thought he would have to give all his blood to his sister, but he agreed.“他认为他将要把自己的血液全部给他的姐姐，但是他同意了。”故选A。

小题4:推理判断题。文章最后一句He thought he would have to give all his blood to his sister, but he agreed.

可知这个小男孩虽然认为会把自己所有的血液给他的姐姐，但是同意了。这件事令人感动，所以是作者记忆深刻。故选D。