胚胎第5个月时主要造血器官是
A．卵黄囊
B．胆囊
C．淋巴管
D．肝脾
E．骨髓
参考答案：E
七千人大会
---Is Mr. Green really badly ill?
--- . He’s in the hospital.
A．I don’t think so
B．I agree with you
C．I hope so
D．I’m afraid so
