问题 单项选择题

环孢素A治疗自身免疫性疾病的机制是()

A.抑制IL-2基因的转录

B.抑制CD28的表达

C.阻断抗原和抗体的结合

D.抑制抗原提呈

E.降低自身抗原含量

答案

参考答案:A

填空题
填空题

选词填空(注意正确形式,每空限填一词, 共10分)

 

Many years ago,when I was   小题1:  out of school and working in Denver,I was driving to my parents’ home in Missouri for Christmas. I stopped at a gas station about 50 miles from Oklahoma City,where I was    小题2: to stop and visit a friend. While I was standing in line at the cash register(收款台),I said hello to an older couple who were also paying for gas.

I took off,but had gone only a few miles when black smoke poured from the back of my car. I stopped and   小题3: what I should do. A car pulled up behind me. It was the couple I had spoken to at the gas station. They said they would take me to my  小题4:  . We chatted on the way into the city,and when I got out of the car,the husband gave me his business card.

I wrote him and his wife a thank­you note    小题5: helping me. Soon afterward,I received a Christmas present from them. Their note that came  小题6: it said that helping me had made their holidays meaningful.

Years later,I drove to a meeting in a nearby town in the  morning. In late afternoon I returned to my car and found that I’d left the lights   小题7: all day,and the battery(电池) was dead. Then I noticed that the Friendly Ford dealership—a shop selling cars—was right next door. I walked over and found two   小题8: in the showroom.

“Just how friendly is Friendly Ford?” I asked and explained my trouble. They                   小题9:  drove a pickup truck to my car and started it. They would accept no payment,so when I got home,I wrote them a note to say thanks. I received a letter back from one of the salesmen. No one had ever taken the time to write   小题10:and say thank you,and it meant a lot,he said.

“Thank you”—two powerful words. They’re easy to say and mean so much.