His life is in such a mess as leads to _____ in an unpleasant cycle.

A．him caught

B．his being caught

C．him to be caught

D．his catching

关于出生后造血，错误的是

A．淋巴器官产生淋巴细胞

B．出生后红细胞、白细胞、血小板均由骨髓产生

C．5～7岁以下幼儿几乎全部骨髓参与造血活动即为红髓

D．长骨骨髓腔为脂肪细胞所代替称为黄髓，即失去造血功能

E．正常情况下，成人主要的造血器官是骨髓