下面小编跟大家一起了解英语四级新闻听力讲解，希望对大家的学习有所帮助

听力练习

1.

A.Afireretardantthatcanstoporslowthespreadoffires.

B.Analarmingsystemthatcandetectwildfires.

C.Amaterialthatisfire-proof.

D.Along-lasting,environmentallysafesubstancethatcanpreventwildfiresfromspreading.

2.

A.Becauseofenvironmentalandweatherconditions.

B.Becauseofburningofflames.

C.Becauseofsmokecausedbywildfires.

D.Becauseofwatershortage.

听力文本

Researchershavedevelopedalong-lasting,environmentallysafesubstancethatcanpreventwildfiresfromspreading.TheStanfordteamsaysthetreatmentcouldgivefirefightersavaluableweaponintheirbattleagainstwildfires.Theresearcherssoughttofindasubstancethatcouldbedeployedtosuchareastostopfiresfromstartinginthefirstplace.Firefightersoftenusechemicalfireretardantstoputoutfires.Fireretardantsarematerialsthatcanstoporslowthespreadoffires.Butfirefightingcrewscurrentlyusethemonlyasakindofreactivetool.Thisisbecausethechemicaltreatmentsarenotdesignedtostayontreesorothervegetationforlongperiods.Theycanquicklydisappearbecauseofenvironmentalandweatherconditions.ThethickliquidtestedbytheStanfordUniversityteamwasfoundtoextendthelifeofthefireretardantswithoutharmingtheenvironment.Suchatreatmentcouldopenuppossibilitiesforfirefighterstotakepreventiveactionsbeforefiresevenstart.Thetestingfoundthatthematerial"providescompletefireprotectionevenafterhalfaninchofrainfall,"thestudysaid.Underthesameconditions,commonlyusedfireretardantsprovidedlittleornoprotectionfromfire.Theresearcherssaidtheycontinuetotestthetreatmentwithstatetransportationandfireofficials.Thisincludesoneofthebiggesthigh-riskareasforthestartofwildfires:roadsides.Thedevelopmentteamsaysthetreatmentcontainsonlysafematerialswidelyusedinfood,drugandagriculturalproducts.Overtime,thematerialwashesawayandbreaksdownsafelyintheenvironment,theresearchersnoted.

Question1:Accordingtothenewsreport,whathaveresearchersdeveloped?

Question2:Accordingtothenewsreport,whydochemicaltreatmentsquicklydisappear?

重点词汇

1.substance:materialwithparticularphysicalcharacteristics物质；材料

2.deploy:tousesomethingorsomeone,especiallyinaneffectiveway有效运用；发挥…的作用

3.retardant:(asubstance)thatmakestheprogressorgrowthofsomethingslower起阻滞作用的，阻止的；阻滞剂，阻化剂

4.reactive:reactingtoeventsorsituationsratherthanactingfirsttochangeorpreventsomething反应的，回应的（非主动求变或预防性的）

5.preventive:intendedtostopsomethingbeforeithappens防止的，预防的