He was very busy that day，but he seemed_________ when we dropped by．

A．unbearable

B．skeptical

C．delighted

D．challenging

大肠癌的诊断依据是

A．近期出现持续性腹部不适，隐痛，胀气，治疗不缓解

B．无明显诱因的大便习惯改变

C．大便带脓血、粘液或血便，而无痢疾、肠炎等病史

D．结肠部位出现肿块

E．原因不明的贫血或体重减轻