下列哪项不是溃疡性口炎的病原（）
A.链球菌
B.金黄色葡萄球菌
C.肺炎链球菌
D.绿脓杆菌
E.柯萨奇病毒
参考答案：E
As there was not much chance to find good jobs in their hometown, many young men now tried to _______ their fortune in cities.
A．find
B．find out
C．seek
D．look at
外槽轮式排种器的主要结构？
