It’ssuchacommoneventthatyouprobablyneveraskedyourselfwhyyousleep.___36___.Infactforsleepresearchersit’soneofthebiggestunansweredquestionsinthefield.Stopandthinkaboutitforasecond.Whyshouldwesleep?

问题标题：

It’ssuchacommoneventthatyouprobablyneveraskedyourselfwhyyousleep.___36___.Infactforsleepresearchersit’soneofthebiggestunansweredquestionsinthefield.Stopandthinkaboutitforasecond.Whyshouldwesleep?_

问题描述：

It’ssuchacommoneventthatyouprobablyneveraskedyourselfwhyyousleep.___36___.Infactforsleepresearchersit’soneofthebiggestunansweredquestionsinthefield.

Stopandthinkaboutitforasecond.Whyshouldwesleep?___37___.Butwesleepeverynightevenwhenwehavehadplentyofrest.Therearenodoubtseveraldifferentanswerstothisquestionbutlet’sjustconsideronegeneralpurposeofsleep:___38___.Humanbeingsarecreaturesthatarenormallyactiveduringdaylighthourswhenoursensesfunctionsmosteffectively.___39___.Wecan’tseeobjectswellourcolorvisionisentirelylostandwedon’thavethesmellingorhearingsharpnessofotheranimals.Soitactuallydoesmakesensetohaveusstaywhereweareduringthedangerousperiodwhennight-wakinganimalsarewalkinghereandthere.Andonesurewaytomakesurewedon’tfalldowneverywhereandgetlostoreatenistohaveusnotmoveforsevenoreighthoursrisingagainonlywhenthelightisbackandoursurvivalchancesarebetter.

It’snottheonlyreasonwesleep.___40___.Perhapseventhemostimportantone.

A.Isitbecausewegettired?

B.Shouldthatputhumanbeingsinaterriblesituation?

C.Butfromascientificpointofviewthisisfarfromanordinarymatter.

D.Butintermsofevolutionitmayhavebeenoneofthefirstreasons.

E.Furthermoreifyouweredesigningananimalwouldyouhaveitcomeintolongperiodsofunconsciousnesseverytwenty-fourhours?

F.Sleepasasurvivalapproach.

G.Atnighthumansdoratherpoorly.

范建东回答：

　　CAFGD

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