Obviously the measures taken by the local government have ______________ the solution to drinking water problems in this region.

A．contributed to

B．referred to

C．turned to

D．devoted to

下列哪项符合肠伤寒时形成的溃疡的形态特点（）。

A.呈烧瓶状，口小底大

B.呈椭圆形，其长轴平行于肠的长轴

C.呈浅表的地图形

D.不规则，边缘呈火山口样隆起

E.呈环形、带状包绕肠管