下列关于胸腺的主要生理功能,错误的是()
A.T细胞的发源地
B.产生和分泌免疫球蛋白
C.制备和分泌胸腺素
D.过滤作用和吞噬异物
E.促进淋巴结发育
参考答案:B, D, E
脊柱附件结核并发截瘫发病率高的原因是()
A.寒性脓肿压迫
B.结核性肉芽组织压迫
C.死骨压迫
D.坏死椎间盘压迫
E.椎弓三面环绕椎管
— Turn off the TV, Jack, _____ your homework now?
— Mum, just ten more minutes, please. [ ]
A. Should you be doing
B. Shouldn't you be doing
C. Couldn't you be doing
D. Will you be doing