问题
单项选择题
既作用于T细胞又作用B细胞的特异性刺激物是（）
A.肿瘤抗原
B.PPD
C.同种异体细胞
D.可溶性SPA
E.EBV
答案
参考答案：A
搜题请搜索小程序“爱下问搜题”
既作用于T细胞又作用B细胞的特异性刺激物是（）
A.肿瘤抗原
B.PPD
C.同种异体细胞
D.可溶性SPA
E.EBV
参考答案：A
| 完形填空 | ||||
| Everyone needs friends. We all like to 1 close to someone. 2 is nice to have a friend to talk , laugh ,and do things with 3 , sometimes we need to be alone. We don't always want people 4 . But we would feel lonely if we never have a friend. No two people are 5 . Friends sometimes don't get on well. That doesn't mean they no longer like each other. Most of the time they will make up and become 6 again . Sometimes friends move away. Then we feel very 7 . We miss them very much, but we can call them and write to them . It could be that we could even see them again. And we can 8 new friends. It is surprising to find out how much we like new people when we get to know them . There's more good news for people who have friends. They live longer than people who don't. Why? It could be that they are 9 . Being happy helps you stay well. Or it could be just knowing that someone cares. If someone cares about you, you take 10 care of yourself. | ||||
|