肛管癌及肛周癌按组织学分类可分为()
A.鳞状细胞癌
B.基底细胞癌
C.恶性黑色素瘤
D.一穴肛原癌
E.肛周Paget病
参考答案:A, B, C, D, E
— The man is always behaving rudely.
— That I guess is ________ people avoid him.
A.because
B.how
C.why
D.Whether
双歧杆菌具有辅助降血压的保健功能。( )