更换灯具的灯泡前应（）灯泡的规格、额定电流和功率。
参考答案：确认
The TV programme on this channel was so____that everyone there felt___.
A．boring, boring
B．bored, boring
C．boring,bored
D．bored,bored
按期权所赋予的权利的不同可将期权分为______。
A．看涨期权
B．看跌期权
C．欧式期权
D．美式期权
