患者，女性，32岁，重症肌无力患者，近2个月症状渐加重，出现四肢无力，进食费力和饮水呛咳，但无呼吸困难，口服吡啶斯的明片有暂时好转

该病人目前首先需要下列哪项处理（）

A.大量抗生素

B.吸氧和维持呼吸道通畅

C.查血常规和血气分析

D.口服吡啶斯的明

E.维持水和电解质平衡

In my opinion, all Mr White ____ good to his students in his class at present. He is very strict in their study.

A．does does does

B．does did do

C．does does do

D．did do does