女，40岁，间断无痛性血尿1年，声像图示右肾中下部6×5cm中等偏低回声肿块，边界清楚，内部回声欠均匀，肿块向肾表面隆起，并推挤肾窦，右肾静脉内实填。考虑诊断是()

A．肾血管平滑肌脂肪瘤

B．肾母细胞瘤

C．肾细胞癌

D．肾盂癌

E．肾腺瘤内呈镶嵌样结构

"Will you be able to finish the job this week?"    " ___ ."

A．I can't say it

B．I don't know that

C．I'm not sure this

D．I don't expect so