当你头疼、流鼻涕、发高烧时，应采取下列哪种做法比较合适[ ]
A．自行买药吃
B．根据电视广告买药吃
C．找医生诊断
D．喝热水，盖棉被睡觉
C
— ________ one and a half days enough for the painting to be finished?
— That's not enough. The painter is ill and only after______ go with it. [ ]
A. Are; he recovers can he
B. Are; he recovers he can
C. Is; he recovers can he
D. Is; he recovers he can
丙烯聚合生成聚丙烯，聚丙烯结构式为（）。
A、
B、
C、
D、
