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已知反比例函数的图象经过点P(﹣2,﹣4),则这个函数的图象位于( )
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计算-+2
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8分Takingatleasttwentyminutesoutofyourdaytowalkorsitinaplacethatmakesyoufeelincontactwithnaturewillsignificantlyloweryourstresshormonelevels.That'sthefindingofastudythathasestablishedforthefirsttimethemosteffectiveamountofanurbannatureexperience.Healthcareprofessionalscanusethisdiscoverytoprescribe开药nature﹣pillsintheknowledgethattheyhavearealmeasurableeffect. WeknowthatspendingtimeinnaturereducesstressbutuntilnowitwasunclearhowmuchisenoughhowoftentodoitorevenwhatkindofnatureexperiencewillbenefitussaysDr.Hunteraleadauthorofthisresearch.Ourstudyshowsthatforthegreatestpayoffintermsofefficientlyloweringlevelsofthestresshormoneyoushouldspend20to30minutessittingorwalkinginaplacethatprovidesyouwithasenseofnature. Toassisthealthcareprofessionalslookingforevidence﹣basedguidelinesonwhatexactlytodistributeHunterandhercolleaguesdesignedanexperimentthatwouldgivearealisticestimateofaneffectiveamount. Overan8﹣weekperiodparticipantswereaskedtotakeanaturepillwithadurationof10minutesormoreatleast3timesaweek.Levelsofstresshormoneweremeasuredfromsaliva唾液samplestakenbeforeandafteranaturepillonceeverytwoweeks.Thedatarevealedthatjustatwenty﹣minutenatureexperiencewasenoughtosignificantlyreducestresslevels. Healthcareprofessionalscanuseourresultsasanevidence﹣basedruleofthumbonwhattoputinanature﹣pillprescriptionsaidHunter.Itprovidesthefirstestimatesofhowna﹣tureexperiencesimpactstresslevelsinthecontextofnormaldailylife.Itbreaksnewgroundbyaddressingsomeofthecomplexitiesofmeasuringaneffectivenatureamount. 1What'sthegreatsignificanceofthestudy A.Itfindsoutanewwaytoreleasestress. B.Itcanhelpdoctorsprescribevariouspills C.Itmakesitclearthatexercisecanhelpreleasestress. D.Itfindsouttheaccurateamountofnatureexperience. 2HowdidHuntergetthefinding A.Byworkingwithsomedoctors. B.Byaskingparticipantsquestions. C.Bycarryingoutanexperiment. D.Bycomparingthepreviousdata. 3WhatdidHunterthinkoftheresultofthestudy A.Ithasdrawbacks. B.It'smeaningful. C.It'sworthresearchingfurther. D.Itneedsmorediscussions. 4What'sthemainideaofthetext A.Naturehascloserelationshipwithstress. B.Weshouldstayinnaturetokeephealthy. C.Wecannotgetclosetonaturefrequently. D.Stayinginnatureforpropertimewilllowerstresslevel.
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下列运算正确的是A.3a-2a=1 B.x8÷x4=x2 C.=-2 D.-2x2y3=-8x6y3
计算的结果是
如图在数轴上标注了四段范围则表示2的点落在
计算×=
计算
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2-的绝对值是
已知2n=a5n=b20n=c试探究a2bc之间有什么关系.
方程的解是
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计算2x4·x3的结果等于
已知x-y+32+=0则x+y的值为
计算=
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