脓血便常见于（）
A.阿米巴痢疾
B.细菌性痢疾
C.溃疡性结肠炎
D.直肠癌
E.以上都对
参考答案：B
I hear that he will be back _______ two weeks' time. [ ]
A. at
B. in
C. after
D. for
试述胃肠道术后膳食的要求。
