男性，32岁，腹泻6年，每日4次稀便，无脓血，无发热，结肠镜检查：直肠、乙状结肠黏膜多发浅溃疡，伴充血、水肿，应诊断为（）

A.疑诊为溃疡性结肠炎

B.确诊为溃疡性结肠炎

C.确诊为Crohn病

D.胃肠功能紊乱

E.肠结核

—You’re coughing badly，Martin. Why not give up smoking?

—Give up smoking？Easier said than done，Amy. Once you ______ the habit of smoking，it is very hard for you to ______.

A．keep up; break it away

B．take up; drop it out

C．pick up; get rid of it

D．build up; do away with it