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假如你是李华，你的美国网友David给你写信，询问近年来多次袭击中国华北的雾霾情况。请你给他写封回信，感谢他的关注，简述雾霾的危害并谈谈你的看法。 注意：
(1)词数不少于100；
(2)可以适当增加细节，以使行文连贯； (3)开头和结尾已给出，不计入总词数。 参考词汇：雾霾smog DearDavid，
I’mgladtoreceiveyourletter. Yours， LiHua 参考范文 DearDavid，
I’mgladtoreceiveyourletter.ThankyouforyourconcernabouttheheavysmoginNorthChina.NowI’dliketotellyousomethingaboutit.
Sincethewinterlastyear，thesmoghasoccurredalotoftimes，
whichhasbroughtmuchinconveniencetoourdailylifeanddonegreatharmtopeople’shealth.Manytrafficaccidentshavehappenedjustbecauseoftheheavysmogwe
ather.Inaddition，
quitealotofflightshavetobeputoffandagreatnumberofpeoplehavetostayathometoavoidthepoisonousair.What’sworse，manypeoplehavesufferedfrombadcoughs，
sorethroatsandotherseriousdiseasescausedbythesmog.Personally，Ithinknotonlythegovernmentbutalsoeveryoneshouldtrytomakeadifference.Istronglyapproveoftheideathatwecantrytodrivelessandbuyenvironmentally-friendlyproducts.Onlywheneveryonehastheawarenesscanwehavecleanerair.
Hopingtohearfromyousoon. Yours， LiHua 2
假定你是李华，你的班级决定组织同学们5月30日端午节
(theDragonBoatFestival) 一起骑自行车去西湖观看龙舟比赛。请你给外教史密斯先生写封邮件邀请他上午8：00在学校门口集合，一同前往，感受中国传统文化。 注意：
(1)词数不少于100；
(2)可适当增加细节，以使行文连贯。 参考范文 DearMrSmith，
Howiseverythinggoing?
OurclassisplanningtocycletotheWestLaketowatchthedragonboatraceonMay30，
whentheDragonBoatFestivaliscelebratednationwide.We’llgatheratourschoolgateat8：
00am.I’dliketoinviteyoutogowithusandexperiencethisuniqueChineseculture.
Thedragonboatrace，originallyheldinmemoryofthegreatpoetQuYuan，hasnowbecomeacommonpracticeanddevelopedintoasport.I’msureitwillbeexcitingandenjoyable.Yourpresencewillcertainlyaddtoourpleasure.Docomeandhavefun.
Lookingforwardtoyourearlyreply. Yours， LiHua