当发现电气起火时，首先应立即切断电源。
参考答案：对
---Do you live in Athens?
---No, we ___ it for the Olympics as well as holidays.
A．just visit
B．have already visited
C．just visited
D．are just visiting
淮海战役中，人民解放军解放的最大城市是[ ]
A．济南
B．郑州
C．徐州
D．开封
