It looks as if they were going to ________us 3,000 dollars for the concert hall.
A:want
B:charge
C:demand
D:cost
连词成句 。
2015年1月9日由昆明至北京MU2036航班受持续雨雪和降温结冰影响导致延误,胳臂乘客情绪激动,将机翼上方3个应急出口打开,致使航班放弃起飞。此事告诉我们( )