—How happy the grandparents are! —Yes, they for fifty years.
A:have been married
B:have married
C:How got married
D:married
— Really? It's quite different from us.
如果胃的结构发生了病变,会影响哪种食物成分的消化?( )
如图所示,是托里拆利实验的规范操作过程,关于托里拆利实验.