2020年高考说明文英语试题汇编(含答案与解析).pdfVIP

2020年高考说明文英语试题汇编（含答案

与解析）

1.（2020年，江苏卷）Forthosewhocanstomachit,

workingoutbeforebreakfastmaybemorebeneficialfor

healththaneatingfirst,accordingtoastudyofmeal

timingandphysicalactivity.Athletesandscientistshave

longknownthatmealtimingaffectsperformance.However,

farlesshasbeenknownabouthowmealtimingandexercise

mightaffectgeneralhealth.Tofindout,Britishscientists

conductedastudy.Theyfirstfound10overweightand

inactivebutotherwisehealthyyoungmen,whoselifestyles

are,forbetterandworse,representativeofthoseofmost

ofus.Theytestedthemen’sfitnessandrestingmetabolic

(新陈代谢的)ratesandtooksamples(样品)oftheirblood

andfattissue.Then,ontwoseparatemorningvisitstothe

scientists’lab,eachmanwalkedforanhouratanaverage

speedthat,intheory,shouldallowhisbodytorelymainly

onfatforfuel.Beforeoneoftheseworkouts,themen

skippedbreakfast,meaningthattheyexercisedona

completelyemptystomachafteralongovernightfast(禁

食).Ontheotheroccasion,theyatearichmorningmeal

abouttwohoursbeforetheystartedwalking.Justbeforeand

anhouraftereachworkout,thescientiststookadditional

samplesofthemen’sbloodandfattissue.Thenthey

comparedthesamples.Therewereconsiderabledifferences.

Mostobviously,themendisplayedlowerbloodsugarlevels

atthestartoftheirworkoutswhentheyhadskipped

breakfastthanwhentheyhadeaten.Asaresult,they

burnedmorefatduringwalksonanemptystomachthanwhen

theyhadeatenfirst.Ontheotherhand,theyburned

slightlymorecalories(卡路里),onaverage,duringthe

workoutafterbreakfastthanafterfasting.Butitwasthe

effectsdeepwithinthefatcellsthatmayhavebeenthe

mostsignificant,theresearchersfound.Multiplegenes

behaveddifferently,dependingonwhethersomeonehadeaten

ornotbeforewal