简介:摘要:本教学设计以科学的时间轴为主线,带领学生化身侦探结合任务导航和小组学习任务单,寻找遗传的相关线索。通过小组合作、拼图、模型拆分等环节,让学生多方位参与课堂,在知识目标达成的同时,树立实事求是和锲而不舍的科学精神。
简介:Ifyoulookatthenightsky,you'lloftenseestarsmovingveryquickly.Infact,theymovemuchmorequicklythantheyshould,accordingtotheirsizeandthelawsofphysics.Scientistsdonotcompletelyunderstandwhythespeedofthesestarsissohigh.Butmanybelievethereasonisbecausemuchoftheuniverseismadeofsomethingcalled"darkmatter."Groupsofstarscalledgalaxies[星系],suchastheMilkyWay,mightevenconsistof90%darkmatter.