阅读理解It’struethatteensdon’tgetenoughsleep,butchangingtheschoolstartingtimewouldhaveachaoticeffectandthroweveryoneoffbalance.Scientistshaveshownthatteensaremoreactivelateratnightth
阅读理解
It’struethatteensdon’tgetenoughsleep,butchangingtheschoolstartingtimewouldhaveachaoticeffectandthroweveryoneoffbalance.
Scientistshaveshownthatteensaremoreactivelateratnightthanchildrenandadults,somost
teensareprobablystayinguplaterforwhateverreasons.“Theresearchersmeasuredthepresenceofthe
sleeppromotinghormone(荷尔蒙)inteenagers’saliva(唾液)atdifferenttimeoftheday.Theylearned
thatthehormonelevelsriselateratnightthantheydoinchildrenandadults-andremainatahigherlevel
laterinthemorning.Measuringthehormoneinthesalivaisagoodwaytoshowthatmostteenshave
sleepproblems,butchangingschoolschedulesisn’tthebestwaytofixthis.Mostpeoplearguingagainst
changingschoolscheduleswouldsaythatitwouldonlycauseteenstostayupandwakeuplater,thus
leavingthemwiththesameproblem.
Thebiggestproblemschoolswouldcomeacrossfromchangingtheirscheduleswouldbetheafter
schoolandjobconflictsstudentsandteacherswouldmeet.“Teachersreportedthatstudentsweremore
alert,andresearchshowedthatafterschoolsportsandjobswouldsuffer.Studentsinthatareamighthavebeenabletodealwithlesstimeforjobsandsportssomehow,butsomeofthemhavepracticeandearlierplansthatwouldbecomeconflictedifthischangeweretooccur.Moststudentsrarelyhavetimetoplaya
sportanddohomeworkbefore9or10o’clock.Openingschoolslatermayhaveworkedforsomeareas,buttherealityisoftenverydifferent.
1.Themeaningoftheunderlinedword“chaotic”inthe1stparagraphiscloseto________.
A.positive
B.apparent
C.negative
D.ambiguous
2.Mostteenshavesleepproblemsbecause________.
A.theyaremoreactivethanchildrenandadults
B.schoolworktakesupmostoftheirtime
C.theirhormonelevelsarehigherlateratnight
D.theyprobablylikestayingupfornoreason
3.WhichofthefollowingisTRUEaccordingtothepassage?
A.Therearemanyconflictsbetweenstudentsandteachers.
B.Someo