I didn’t feel like ________, so he suggested ________ an English song right away.

A．reading; practising singing

B．reading; practising to sing

C．to read; practicing singing

D．to read; practicing to sing

外周血单个核细胞Ficoll分层液法从上而下第2层为

A．血浆层

B．嗜酸粒细胞层

C．单个核细胞层

D．嗜中性粒细胞层

E．红细胞层