英语听力精选进阶版 17901

 

Beijing Issues First Smog 'Red Alert¹'

MONDAY

Pollution in the capital is so bad that schools will close and construction will stop.

1 alert   

adj.机警的，活泼的，机灵的；vt.使...警觉

参考例句：

• Drivers must be on the alert for traffic signals.驾驶员必须密切注意交通信号。
• The rabbIt'seems to be very alert all its life.兔子似乎一生都小心翼翼，十分警觉。