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1、根据本节教材用实验和猜测相结合的方法来说明生命起源的特点，教学方法也就选择学生观察投影片、猜测和查资料相结合的方法进行教学。有关英语演讲比赛作文 导语：有两种东西，我对它们的思考越是深沉和持久，它们在我心灵中唤起的惊奇和敬畏就会日新月异，不断增长，这就是我头上的星空和心中的道德定律。以下小编为大家介绍有关英语演讲比赛作文文章，欢迎大家阅读参考! 有关英语演讲比赛作文 Junkfoodisnotgoodforpeople'shealth.Lastweek,Iaskfortystudentsinou
2、rschool"howdoyouthinkofthejunkfood?".Manypeoplethinkthejunkfoodisnotgoodfortheirhealth,buttheyeatthemeveryday!Junkfoodisgreatharm,notonlycandamagetoourhealth,andwillmakeussick,butalsoalotofpeopledonotnoticethatjunkfoodisnowdoingharmtous,soIwanttowriteso
3、methingtotalkaboutjunkfood. Withthedevelopmentofourlife,manypeoplearebusywiththeirworkandenjoyeatingfastfood.Thisproblem,however,hasgreatlyincreasedinrecentyearsregarditasjunkfood. Eachcoinhastwosidesitbringsusbenefitsto意大利医生雷地证明腐肉不能生蛆的实验投影片，巴思德的“鹅颈瓶实
4、验”投影片，原始地球的投影片，米勒实验的投影片。根据本节教材用实验和猜测相结合的方法来说明生命起源的特点，教学方法也就选择学生观察投影片、猜测和查资料相结合的方法进行教学。people.Itisconvenientforustohavesomefastfood.itbringsusmorejunkfoodyoueat,theunheathieryouwillbe.Andthejunkfoodmayincreasetheriskofdiseaseandotherkindsofhealthproblems
5、.Weshouldpaycloserattentiontoourhealth.Insteadofhavingjunkfood,eatmorefruitsandvegetableswhichcontainmorevitamins. Onthewholedoesharmtoourhealth.So,getridofthebadeatinghabitstostayhealthy. Iamanactivegirl,andIlikeplayingsportsverymuch.Myfavouritesport
6、isswimming.TodaymytopicisTointroducemyfavouritesport.WhenIamswimminginthepool,Iamveryhappy.Ilooklikealovelyfishinthepond.Ienjoyswimming,becauseswimmingcanmakemestrongandhealthy.Itcanalsobringmealotofhappiness. Iswimthreetimesaweek.MostoftenIswiminmysch
7、ool.IfeelveryhappywhenIswiminschoolwithmyfriends.IoftengotoswimwithmygoodfriendLily.Shelikesswimming,too.Andsheisverygoodatit.Shealwaysswimsbetterthanme.SometimesIswimintheswimmingclubnearmyhomeduringsummerholidays.意大利医生雷地证明腐肉不能生蛆的实验投影片，巴思德的“鹅颈瓶实验”投影片，原
8、始地球的投影片，米勒实验的投影片。根据本节教材用实验和猜测相结合的方法来说明生命起源的特点，教学方法也就选择学生观察投影片、猜测和查资料相结合的方法进行教学。Swimmingisnotsohardassomepeopleimagine.ButmanyyoungpeopledreamtobecomebigstarslikeSunYang,whichisdifficultbecauseyoushould,firstofall,begiftedandthenh
