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Climatechangeandotherfactorsmakethepollenseasonlonger
花粉过敏季为什么越来越提前了？
resultcausewronggrowheavyupsetstickexperienceprotectcomparerelationcompete
“Achoo!”Youmighthearpeoplesneezing(打喷嚏)alotnow.That’sbecausespringistheseasonofpollen
allergies(花粉过敏)!Thinkofyourimmunesystem(免疫系统)as“soldiers”______1______yourbody.Usually,
thesesoldierskeepyousafefromthingslikeviruses(病毒).However,sometimestheymakeamistakeand
thinkpollenisalsodangerous.Pollenhelpsplantsspreadandgrow,butsomepeople’simmunesystems
_______2_____fightit.Thisresultsinsneezing.
AccordingtoChinaDaily,Beijingis______3______ahigherlevelofjuniper(刺柏)pollenthisspring.Climate
changemightbethe“criminal.”_____4_______withtheweatherinthepast,thewholeworldisgetting
warmer,flowersbloomearlierandlivelonger,makingthepollenseasonlonger.Astudyshowsthatsome
countriesinEuropealsohavethisproblem.What’smore,warmerweatherbringsmorecarbondioxide(⼆氧
化碳).Plantsuseitasfood______5______,whichhelpsplantsmakemorepollen,asreportedbyChina
MeteorologicalNews.
Also,theallergiesare______6______tomorecarsandfactorieswhichletoutgasesthatpollutetheair.This
pollutioncan_____7_______topollen,makingallergiesworse.Somepollutioncanevenbreakpolleninto
smallpiecesthatreachdeepintoourlungs(,______8______serioushealthproblems.
Youmightseenewtreesinyourneighborhood.Plantsfromotherplacescan______9______changethetypes
andamountsofpollenintheair.Thiscan____10________thelocalecosystem,sometimesresultinginmore
allergies.Forexample,ryegrassfromEuropecausesspringallergieseveryyearinAustralia,accordingtoa
studyinGlobalChangeBiology.
Climatechangeandotherfactorsmakethepollenseasonlonger
花粉过敏季为什么越来越提前
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