胃溃疡行毕Ⅱ式胃大部切除术后5天，出现上腹膨胀感和呕吐，呕吐物含大量胆汁

可能的原因是（）

A.术后胃滞留

B.术后胃肠吻合口梗阻

C.术后输出襻空肠口梗阻

D.术后胃肠吻合口输入襻梗阻

E.术后麻痹性肠梗阻

Diana bought a stereo for $530, which was the retail price plus a 6 percent sales tax. How much money could she have saved if she had bought the stereo at the same retail price in a neighboring state where she would have paid a sales tax of 5 percent ？（）

A．$1.00

B．$2.65

C．$4.30

D．$5.00

E．$5.30