男性，62岁，主因排尿困难6年，不能排尿1天来诊。查下腹部扪及囊性包块，直肠指诊前列腺Ⅱ°大，质地韧，表面光滑，中央沟消失。血PSA20ng/ml。

该病人最可能的医疗诊断是（）

A.肾结核

B.膀胱结石

C.前列腺增生

D.前列癌

E.膀胱癌

—We experienced a freezing cold winter this year.

—Oh, yes. I think ______ is the power of global warming that the climate goes from one extreme to

the other. [ ]

A. such        

B. this          

C. so            

D. it