题目内容

CD4分子的作用是

A. 稳定TCR结构
B. 增强Th与APC的结合
C. 增强CTL与靶细胞的结合
D. 参与T细胞活化信号的转导
E. 与MHCII类分子结合

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能特异性识别抗原的免疫细胞有

A. T细胞
B. NK细胞
C. B细胞
D. 巨噬细胞
E. 中性粒细胞

按功能不同可将T细胞分为

A. 辅助性T细胞
B. 记忆性T细胞
C. 细胞毒性T细胞
D. 初始T细胞
E. TCRαβ

B细胞的主要功能有

A. 产生抗体
B. 无需诱导即可呈递抗原
C. 细胞毒作用
D. 递呈抗原
E. 分泌细胞因子

1. Listen to the dialogues and fill in the blanks.Words and Expressionsconvenient方便的open an account开户online bank网上银行revolution改革；革命simulate模仿rush hours交通拥挤时间traffic jam交通拥堵get off work下班Dialogue 1S:Aunt Cindy, do you shop①often?C:Yes. It’s very convenient and the price is even②.S:Last week, I tried to buy some books online, but I didn’t know how to pay for them.C:You should open an account at the online bank first.S:Are there many things online?C:Sure. You can find things all over the③. Let’s check it out online!S:That’s amazing. Oh, an online virtual supermarket?C:Let’s④to check it out.S:Oh, I got it. It simulates the real supermarket, which makes it feel so real. Mom will love it. She loves shopping in supermarkets.C:No doubt about it. Shopping online will get more and more⑤. It’s a real revolution about people’s consuming habits.Dialogue 2A: Here we are on the subway.M: Yes, we are travelling in rush hours. It could be very crowded in the⑥and after 6 o’clock in the afternoon.A: I heard that many people⑦.M: Yes, many families have their own cars.A: Why don’t they drive? Isn’t a car more convenient than the subway?M: Well, it is⑧to find a parking place in the city. Besides, parking is expensive in the downtown.A: I see. I saw many public bicycles⑨the subway station. I think we can go back home by bike⑩.M: OK. Bike riding will help us do some exercise. And we won’t have to worry about traffic jam after getting off work.