The lady walked around the shops, _____ an eye out for bargains. [ ]

A. keep

B. kept

C. keeping

D. to keep

各型Cushing综合征共有的特征是（）

A.糖皮质激素分泌异常

B.能被小剂量地塞米松抑制

C.皮质醇分泌减少

D.呈昼夜分泌节律

E.以上都不是