在免疫反应中，有关T细胞的叙述正确的是[ ] A．在胸腺内才能

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问题选择题

在免疫反应中，有关T细胞的叙述正确的是[ ]

A．在胸腺内才能分化成效应T细胞

B．能识别呈递抗原

C．能通过释放淋巴因子,消灭抗原

D．受到抗原刺激能产生抗体,识别靶细胞

答案

答案：B

填空题

用所给词的适当形式填空。

1. Look at the . How big they are! (library)

2. Look! The boy is to the classroom. (run)

3. There aren't exercises on the paper. (some)

4. Children in often play ping pong. (Chinese)

5. homework can you do today? (how many)

6. There are some small near Tianjin. (city)

7. Do you know ? (where is he from)

8. Oh, your shoes are like . (Tom)

9. Can you a horse like that man? (ride)

10. I want to buy two bags of for the children. (soap)

选择题

当汽车通过拱桥顶点的速度为10m/s时，车对桥顶的压力为车重的

A．15m/s

B．20m/s

C．25m/s

D．30m/s