题目

25．病毒EV71常引起儿童手足口病、病毒性咽喉炎。下列关于人体对该病毒免疫过程的说法正确的是 A．EV71侵入机体后经T细胞摄取处理，暴露出EV71所特有的抗原 B．效应T细胞通过释放淋巴因子攻击被EV71入侵的细胞 C．患儿痊愈后若再次感染该病毒，相应的记忆细胞会迅速产生抗体消灭病毒 D．患儿感染EV71后，需体液免疫和细胞免疫共同作用才能彻底清除五、 根据首字母提示补全短文。   When you are. in England,you must be very c 1 in the streets. People must drive on the 1 2 -hand side of the street. Before you c 3 a street,you must look right first and then left. If the traffic lights are red,the traffic must s 4 . Then people on foot can cross the road. If the traffic lights are green the traffic can go. People on foot m 5 cross. In the morning and in the evening when people go to work or come back from work,the traffic is very h 6 When you go by b 7 in England,you have to be careful,too. Always remember the traffic keeps to the left. Look first carefully,or you will go w 8 . In many English cities,there are many buses with two f 9 You can sit on the second floor. From there you can see the city very w 10 . It’s very interesting!1. 2. 3. 4. 5. 6. 7. 8. 9. 10.