问题 单项选择题 A1/A2型题

T细胞阳性选择的主要目的是().

A.选择出对自身抗原不发生免疫应答的细胞克隆

B.选择掉对自身抗原发生免疫应答的细胞克隆

C.实现自身免疫耐受

D.实现对自身MHC分子的限制性

E.实现TCR功能性成熟

答案

参考答案:D

完形填空

It’s November 6th today. Ben and Lisa want to buy a birthday   46 . It’s their   47 birthday.

“What does she   48 ?” Ben asks Lisa. “I don’t know.” Lisa says, “We bought(买)her some hamburgers last time.”

“Yes,” Ben says, “and we ate (吃) some of them! We can’t do that   49 .”

“Let’s buy her a book. She likes   50 .” Lisa says.

“What kind of book would she like?” Ben asks.

“I don’t know.” Lisa says, “Let’s go   51  ask her.”

The children go to the living room. Mrs. Wilson is watching TV.

“We want to buy a book   52  you, Mom.” Lisa says.“What book do you want?”

  53  money do you have?” Their mother asks them.

“We have twenty-five yuan.” Ben says.

“Good. That’s enough(足够) for the book I want. It is Quick and Easy Cooking.

The children buy their mother the book for her birthday. They   54  her present this time, but they often eat the nice food because their mother learns a lot   55  the book and cooks for them. They are very happy.

小题1:A.flower      B. present          C.cards

小题2:A. mother’s   B. Lisa’s          C.brother

小题3:A.need         B.can               C.must

小题4:A.before      B.ago               C.again

小题5:A.running      B.shopping          C. reading

小题6:A. but         B.and               C.so

小题7:A. for         B.on                C.about

小题8:A.How much     B.How often         C.How many

小题9:A.not eat     B.eat               C.don’t eat  

小题10:A.from       B.about              C.with

单项选择题