最易发生幽门梗阻症状的溃疡是（）
A.胃角溃疡
B.胃窦溃疡
C.十二指肠球部溃疡
D.幽门管溃疡
E.球后溃疡
参考答案：D
--- What will the weather be like tomorrow?
--- It ______ be rainy, cloudy or sunny. Who knows?
A．must
B．might
C．shall
D．should
“删除背景”工具是PowerPoint 2010中新增的图片编辑功能。
