问题 单项选择题

环孢霉素A是一种能抑制T细胞增殖的药物,它能使人体免疫系统处于无应答或弱应答状态,因此环孢霉素A可用于()

A.提高器官移植的成活率

B.清除宿主细胞内的结核杆菌

C.降低恶性肿瘤的发病率

D.治疗艾滋病

答案

参考答案:A

解析:由于环孢霉素能抑制T细胞增殖,因而移植器官受到的细胞免疫较弱,器官成活率高,A正确;结核杆菌首先需要细胞免疫使抗原暴露,然后通过体液免疫清除,使用该药物后免疫能力将降低,B错误;恶性肿瘤需要细胞免疫,C错误;艾滋病毒破坏的就是T淋巴细胞,D错误。考点:本题考查免疫相关知识,意在考查考生从题中获取信息能力,理解所学知识的要点,把握知识间的内在联系的能力。

完形填空

Not long ago, I made up my mind to read a lot of books to get more knowledge. So I went to the library and __1___ happily with several books. But after a few days, I felt impatient. The ___2__ of finishing all of them seemed impossible, because I always found it hard to ___3__ down to read a whole book. I didn’t know what to do with it. Then ___4___ one day I thought of “Why not make reading for fun?” it gave me __5___ again. Reading is a journey of spirit. Every time we read a book, we are actually(事实上) talking ___6___ the writer. I tried to put all my effort into his or her books, __7___ I could feel all of his or her happiness and sadness. Now books have become a part of my life.

Attitude (态度) can make a great ___8___. Someone once said, “Even though the situation is bad, people still have one freedom(自由) to __9___ their attitude.” So, don’t complain about study or work. It helps __10___. Try to see things from a different way. I’m sure this will change the situation and help you a lot.

(    )1. A. sang        B. jumped      C. returned      D. danced

(    )2. A. way        B. habit        C. suggestion    D. idea

(    )3. A. calm        B. sit          C. lie          D. turn

(    )4. A. sadly        B. quickly      C. suddenly     D. hardly

(    )5. A. advice       B. hope        C. time         D. knowledge

(    )6. A. with         B. about       C. of           D. at

(    )7. A. because      B. though      C. but          D. so

(    )8. A. decision      B. difference   C. discussion     D. promise

(    )9. A. announce     B. choose      C. show         D. hide

(    )10. A. nothing     B. anything     C. everything     D. something

单项选择题