人教版高中英语选择性必修第三册课后习题 Unit 2 HEALTHY LIFESTYLE Unit 2单元提能强化练.docVIP

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UNIT2单元提能强化练

Ⅰ.阅读理解

A

Whenhomeworkandtestskeepyouuplateatnight,youmayplantomakeupforyourlostsleepduringtheweekends.Butisituseful?

AstudypublishedinthejournalCurrentBiologyshowsthatthehabitofsleepinginonweekendsdoesn’tfiagethathasbeendonebyalackofsleepduringtheweek.Evenworse,itmaydamageyourhealth.

Inthestudy,whichwasconductedover10days,36healthyyoungmenandwomenwithdifferentsleeprequirementsweredividedintothreegroups.Thefirstgroupwereaskedtosleepninehoursanightandthesecondgroupfivehoursanight.Themembersofthethirdgroupsleptforfivehoursonweekdaysbutrestedaslongastheywantedontheweekend.

Theresearchersfoundthatpeoplewholackedsleepatemoresnacksandgainedweightquickly.However,thiswasn’tthecaseforthefirstgroup.

Thatcouldbepartiallyduetotheshiftingofthebiologicalclockandchangestocertainbodyhormones,especiallyhungerhormones.Inordertocatchupontheirsleepduringweekends,peopleinthethirdgroupwouldeatlaterasahabit.Sotheirbiologicalclocksshifted,whichalsochangedtheproductionofhungerhormones.

“Thehormoneleptin(瘦素)decreasesappetite(胃口),whilethehormoneghrelin(胃饥饿素)increasesappetite,”explainedUSresearcherVsevolodPolotsky.“Sleepshortagecausestheleptintodropandtheghrelintorise,soyou’rehungryandeatmore.”

Andeveniftheytriedtosleepforaslongastheywantedtoduringweekends,accordingtoresearchers,itwasstillnotenoughbecausetheyfounditdifficulttofallasleep.

Moreover,shortandinsufficientsleepscheduleswillleadtoaninabilitytochangebloodsugarandincreasetheriskofmetabolic(新陈代谢)diseaseinthelongterm.

1.Whatdoweknowaboutthestudy?

A.Participantsweredividedintotwogroups.

B.Researchersstudied36childrenandadults.

C.Itlastedformorethantwoweeks.

D.Eachgroupfollowdifferentsleeprequirements.

2.