________ in his book, he didn't notice me ________ I entered the room.

A．Devoted; when

B．Absorbed; while

C．Absorbed; when

D．Devoted; while

患者近日偶感风寒，出现恶寒发热头痛，肌表无汗，肢体酸楚疼痛，口苦而渴者。治疗应首选的方剂是（）。

A.参苏饮

B.败毒散

C.桂枝汤

D.小青龙汤

E.九味羌活汤