2021英语四级听力：Crisis思维导图

Lifeisacontest!Whowillwin?Abluebirdandsparrowbothcompeteforspacetobuildtheirnests.Afast-growingmapletreeandslower-growingdogwoodcompeteforthesunlighttheybothneed.Oilcompeteswithcoalandnuclearpowerasanenergysourceforelectricpowerplants!

Thereisaproblem.Thereisalimitedamountofspaceforbirds,sunlightfortrees,andenergyforpeople!Ifwedonotcutbackonourusesofsomeofourresources,somedaytheywillbegone!

Howcanweuseenergytodayandknowwewillhaveenoughtogoaroundinthefuture?Wecanchoosealternate,orreplacement,energyresources.Ittakestheearthmillionsofyearstocreatecoal,oil,andgas.Theyarenonrenewableresources.

Solarenergy,windenergyandwaterenergyarerenewableresources.Ittakestheearthmillionsofyearstocreatecoal,oil,andgas.Theyarenonrenewableresources.

Solarenergy,windenergyandwaterenergyarerenewable.Whatotherwayscanweconserveoursources?Howcanwemakesurethereisalwaysenoughtogoaround?

Usefulwordsandexpressions:

1.bluebird蓝知更鸟

2.sparrow麻雀

3.dogwood山茱萸

4.powerplant发电厂，发电站

5.alternate替换物

6.nonrenewableresources不可再生资源

7.conserve保存，保藏