Question

----It’s traditional in China to             firecrackers on Spring Festival.
----But the serious smog（雾霾）nowadays needs us to stop it.

A．give out

B．set off

C．put off

D．show off

Answer 1

B   

试题分析：句意：春节放鞭炮是中国传统。但现在严重的雾霾需要我们阻止它。give out分发，赠送； set off        出发; （使）开始; 引起; 点燃; put off推迟；show off使突出; 炫耀，卖弄。所以选B。