Prices ______ all the time. It's no wonder that we've spent so much money recently.

A．rose

B．had risen

C．were rising

D．have been rising

用糖皮质激素治疗溃疡性结肠炎时，宜选用主要作用于肠道局部而全身不良反应较小的类型。下列具有此种作用的糖皮质激素是（）

A.泼尼松

B.泼尼松龙

C.布地奈德

D.地塞米松

E.琥珀酸钠氢化可的松