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简介：<正>Background:Increasingcaloricexpenditureinphysicaleducationisconsideredaneffectiveschool-basedapproachtoaddressingthechildobesityepidemic.Thisstudywasdesignedtodeterminesynergisticinfluencesofstudentcharacteristicsandlessonfactorsoncaloricexpenditureinelementaryandmiddleschoolphysicaleducation.Methods:Thestudyusedamulti-leveldesign.Level-1factorsincludedpersonalcharacteristics:age,gender,andbodymassindex.Level-2factorsincludedlessonlength,content,andschoollevel.BasedontheCenterforDiseaseControlandPreventionage—genderadjustedgrowthchart,studentsin87classesfrom14elementaryand15middleschoolswerepre-screenedinto"Overweight","Healthyweight",or"Thin"groups.Oneboyandonegirlwererandomlyselectedfromeachgroupineachclassasdataproviders(264elementaryand294middleschoolstudents).Caloricexpenditurewasmeasuredin243physicaleducationlessonsusingaccelerometers.Results:Analysisofvariancerevealedandhierarchicallinearmodelingconfirmedseparateagebybodymassindex,agebygender,andcontentbylesson—lengthinteractioneffects,suggestingthatthepersonalandlessonfactorsinfluencedcaloricexpenditureindependently.Oldermaleandheavierstudentsburnedmorecaloriesinalllessons.Studentsburnedmorecaloriesin45—60minsportskillorfitnesslessonsthaninshorter(30min)orlonger(75—90min)gameormulti-activitylessons.Conclusions:Thehypothesizedcross-levelinteractionwasnotobservedinthedata.Caloricexpenditurecanbeoptimizedin45—60minsportskillorfitnessdevelopmentlessons.Itcanberecommendedthatschoolsadopt45—60minlessonlengthandprovideskillandfitnessdevelopmenttasksinphysicaleducationtomaximizecaloricexpenditure.

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简介：一、教学背景1．教学内容本课的教学内容是北京版《英语》二年级上册第二单元的第八课，是一节单元复习课。本单元的话题是“WhatDoYouDoonSunday？”。此话题与学生生活密切相关，也是学生感兴趣的话题，学生乐于谈论彼此的周末生活。

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简介：我们只要经常想到英语，用英语进行思维，并且能大胆讲英语，那么学习英语就一定不难。下面是一些常用的体育课口令，上课时我们如果经常有意用下面这些英语去发令，就能很容易地记住它们。这难道不是一举两得的事吗？Pleasehaveatry!

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简介：一、教材分析本课为JEBookⅡ中Unit23（Afamousperson）的第2课时，是在第1课时的基础上介绍BillGates的成长过程及奋斗经历，文中有较乡单词和疑难长句，是能够培养学生猜测、分析、判断能力的阅读课文。

简介：一、教学内容1.操场上常见的运动设施:slide,swing,junglegym,sandbox。2.操场上常见的活动:sliding,swinging,playinghopscotch,bouncingaball,running,climbing,jumpingrope,running,throwingaball,catchingaball。

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简介：摘 要：本文先从教学反思的定义入手，说明了教学反思的对教学的促进作用，并以笔者的一节公开课为例，从教学设计的梳理，成功之处的回味和不足之处的反思等角度，进行了全面深刻的教学剖析和反省，进而针对不足之处提出对策，即减轻学生学习焦虑和运用以读促说的教学手段。

简介：教材分析本课是第2单元Heroes的第1课NationalHero.语篇内容主要是航天英雄杨利伟以及中国第一次载人宇宙飞船＂神舟＂五号的发射、升空、飞行及着落过程.通过课文学习,学生将掌握有关宇宙飞船及其发射过程的词汇,内化课文的阅读内容,转化为自己的语言,复述课文,并使用was/weredoing...when...句式模拟采访杨利伟.

简介：ThemiludeerhasreturnedtoChina.ThiskindofdeerusedtobecommoninChinalongago,buttheonlydeeraliveintheworldwerekeptintheparkwhichbelongedtotheDukeofBedfordinEngland,wheretheyenjoyedthecoolwetweather.

简介：ThehugewinterstormofDecember23–29,2015deliveredheavyrainfallinabroadswathacrosstheUSA,delugingEast-CentralMissouri.Recordhighriverlevelsweresetatmanysites,butdamagesweremostpronouncedindevelopedfloodplainareas,particularlywherehighleveeswerebuiltorriverchannelsgreatlynarrowed.Anaverageof20cmofrainthatmostlyfellinthreedaysimpactedtheentire10300km2MeramecBasin.Comparedtothepriorrecordfloodof1982,thehighestrelativestage(+1.3m)onMeramecRiveroccurredatValleyParkproximalto(1)anewlevee,(2)alandfillinthefloodway,(3)largefloodplainconstructionfills,and(4)tributarycreekbasinsimpactedbysuburbansprawl.Eventhoughonlyasmallfractionofthe1.8millionkm2MississippiRiverwatershedaboveSt.Louisreceivedextraordinaryrainfallduringthisevent,thehugechannelizedrivernearandbelowSt.Louisrapidlyrosetosetthe3rd-highesttothehigheststagesever,exhibitingtheflashyresponsetypicalofamuchsmallerriver.

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