----It’s traditional in China to             firecrackers on Spring Festival.
----But the serious smog（霧霾）nowadays needs us to stop it.
A．give outB．set offC．put offD．show off
B   

試題分析：句意：春節(jié)放鞭炮是中國傳統(tǒng)。但現(xiàn)在嚴(yán)重的霧霾需要我們阻止它。give out分發(fā)，贈送； set off        出發(fā); （使）開始; 引起; 點(diǎn)燃; put off推遲；show off使突出; 炫耀，賣弄。所以選B。
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