超抗原能激活大量T细胞,约占T细胞库的()
A.40%~80%
B.20%~40%
C.5%~20%
D.1%~3%
E.0.1%~0.5%
参考答案:C
22. ----I’m going downtown. ----Come on, _______.
A.I’ll give you a lift
B.You are welcome
C.Don’t do that
D.Come with me
缺陷跟踪系统只针对对测试人员来使用。()