— It is said that a man is more than twice as likely to die of skin cancer as a woman. 

— _____ is the fact that scientific statistics have proved it. [ ]

A. Such

B. This

C. That

D. So

女，60岁，便血，大便次数增多伴里急后重2个月余，直肠指检可触及直肠前壁结节状肿块，其便血的原因首先考虑

A．Crohn病
B．直肠癌
C．细菌性痢疾
D．阿米巴痢疾
E．痔