东南亚的主要粮食作物是_________，著名的稻米出口国有_________和越南。
水稻；泰国。
It was not until midnight ______ the parents finally found their lost kids. [ ]
A. that
B. when
C. while
D. as
下列哪项不是慢性胆囊炎的CT表现()
A．胆囊缩小
B．囊壁增厚
C．囊壁水肿
D．囊壁欠规则
E．囊壁可钙化
