问题 单项选择题

肿瘤细胞表达的能介导CTL凋亡的是

A.FasL
B.Fas
C.P53
D.异常MHC分子
E.B7

答案

参考答案:A

解析:在CTL细胞识别肿瘤细胞后,肿瘤细胞表面表达的高水平FasL与CTL细胞表面的Fas相互识别,触发靶细胞内部的凋亡程序,介导CTL凋亡。

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My Year Abroad                                                           

This month in Travelers Corner there are three teenagers’ experiences in year-abroad programmes.

Mariko Okada – Tokyo

My year abroad in the United States was a fantastic experience. I’m not a shy person, and I was very comfortable speaking to everyone. So I got lots of speaking practice. I also learned lots of interesting things about American culture. When I got home, my friends all said that I had improved so much! I hope to go back again in the future.

Carla Fonseca – Rio de Janeiro

I spent last year studying English in London. I’m from a small town, and London is a very big city. Sometimes I felt it was too big. There were so many people to talk to, but I always felt bad about my English. I missed my family, and I really missed my two cats. My roommate was always using our telephone, so I hardly had the chance for a nice long talk with my parents. I think it was a good experience for me, but I’m glad to be home!

Alvin Chen – Hong Kong

Studying in New Zealand was a fun experience for me, but it was also lots of hard work! I had English classes six hours a day, five days a week——with lots of homework. I also kept a diary of my experience. I like to write, and I wrote two or three pages in my diary every day. On Saturdays, my homestay family took me to lots of interesting places and showed me so many wonderful things about the culture. I’m really glad I went!

小题1:All the three teenagers went abroad           .

A.to study English

B.to visit friends

C.to have a holiday

D.to find a job小题2:Who didn’t really enjoy the stay in a foreign country very much?

A.Mariko.

B.Carla.

C.Alvin.

D.None of them.小题3:Travelers Corner is most probably         .

A.a sports club newsletter

B.a science documentary

C.a travel magazine

D.a news website

单项选择题 A1型题