受抗原刺激后发生免疫应答的部位是
A.骨髓B.胸腺C.腔上囊D.淋巴结E.唾液腺
参考答案:D
下列属于生物的是( )
A.恐龙骨骼
B.珊瑚
C.珊瑚虫
D.钟乳石
---I’ll do the washing-up. Jack, would you please do the floors?
--_______.
A.Yes, please
B.No, I don’t
C.Yes, sure
D.No, not at all