应用文写作:Dear Mr. SmithI am Li Hua, a member from the English Club of outschool. In order to arouse students' awareness of savingfood, our club is organizing an English speech contestthemed"Clear Your Plate" Campaign, which advocatessaving against wasting.The contest is scheduled to be held in the conferencehall on Novermber 4th. We are expecting an expert like youto be our judge, so it would be our great honor ifuldaccent our invitation ad join us.Thank you in advance and wish you ali the bestYLi Hua

6.B【解析】Na2S、S、Na2S2O2、SO2、H2SO1都含有硫元素.且按硫元素的化合价升高的顺序排列。NH、N2、NO、NO2、NaNO3是按氮元素的化合价升高的顺序排列的。故选B。

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