慢性肉芽肿病的发生原因是()
A.先天性胸腺发育不全
B.吞噬细胞功能缺陷
C.B细胞发育和域功能异常
D.补体某些组分缺陷
E.T、B细胞混合缺陷
参考答案:B
Education knows no limits. It___take place anywhere, whether in a kitchen or in the job. [ ]
A. should
B. can
C. need
D. must