世界贸易组织的成员资格分为（）。
A、创始缔约国
B、新加入成员
C、创始成员
D、新加入国
参考答案：B, C
The villagers, _________ had been damaged by the flood, were given help by the Red Cross.
A．all of their homes
B．all their homes
C．whose all homes
D．all of whose homes
锅炉蒸汽过热器的（）要装设压力表。
A.出口
B.入口
C.中间
