防火墙上不应开设门、窗、洞口，当必须开设时，应设置（）防火门、窗。
A．能自行关闭的甲级
B．能自行关闭的乙级
C．甲级
D．乙级
参考答案：A
分手后，不辜负当年的情义应该（）对方，。
A.宽恕
B.怨恨
C.乞求
D.无视
What can you do, Jim? I can ______________ the floor.
What can Liu Ying do? She can ______________ ______________ ______________.
What can Mary do? She can ______________ ______________ ______________.
What can you do, John? I can ______________ ______________ ______________.