固有免疫应答的特点是（）。A.病原体感染2周后诱导的免疫应答 B_爱下问搜题

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问题单项选择题

固有免疫应答的特点是（）。

A.病原体感染2周后诱导的免疫应答

B.αβT细胞参与的免疫应答

C.在病原体感染后迅速发生的免疫应答

D.进化上不保守的免疫应答

E.依赖TCR激活的免疫应答

答案

参考答案：C

解析：

本题为综合理解类型题，考核对固有免疫的性质、诱导时间的理解。固有免疫（innate immunity）是生物在长期种系进化过程中形成的一系列防御机制。固有免疫对侵入的病原体迅速（96小时内）产生应答，发挥抗感染效应，因此正确答案选C。

解答题

把一张长60厘米，宽40厘米的长方形铁皮剪成同样大小的正方形铁皮，要使剪成的正方形最大且无剩余，正方形的边长应是多少厘米？可以剪几个？

完形填空

When I was 8, a gentleman came to my orphanage(孤儿院) every week to lead us in woodworking projects. I remember the night that I finished my first project. It was a small table and I looked upon it as though I had created a life. I could        wait to give it to Mother Winters, our orphanage’s leader, as a       .
Since the tables’ coating was still       , the man asked us to wait a while before taking our tables to our dormitories. But I couldn’t wait. I dashed out the door in a       , carrying my table, smiling from ear to ear.
“It is very pretty,” Mother Winter smiled at me. When she touched the coating she noticed that it was still wet. Then she asked me why I had brought. I stood with       down. “Were you supposed to bring this home?” she asked. “No, ma’am, ” I said.
Mother Winters kicked the table over and all of the legs were        off. She made me throw the table outside. After Mother Winters left, I went out to get my little table. There was dirt all over it.        silently, I hid the ruined table in my closet. A year later I gave it to Mother Henderson, my houseparent, to       .
Thirty years later I learned Mother Henderson was living in Asheville, North Carolina, so I drove up to see her. She gently asked me to come down to her basement and help her get something       . “Do you remember that?” she asked,        into a dark corner. I did. I could not speak for fear of crying. “Roger, I want you to        it.” Mother Henderson gave me back the little        that I had given up for lost so long ago. She had kept it, never       if she would see me again.
Today, I look at the table with bittersweet memories. I think of when Mother Winters forced me to throw it away. But I am also      and joyful at the kindness of Mother Henderson, who kept it as a remembrance of a young orphan who tried very hard to       .

D．complaining

D．entertained