直肠指检，肠壁上扪到高低不平硬块，肠腔狭窄，指套染有脓血和粘液者应考虑
A．内痔B．肛瘘C．外痔D．直肠息肉E．直肠癌
参考答案：E
—What did you do this morning?
—I went ________. [ ]
A. shop
B. shops
C. to shop
D. shopping
血液分析仪测定血红蛋白常用波长为（）。
A.530nm
B.535nm
C.540nm
D.550nm
E.560nm
