【学习目标】
① 单词: experiment , exhibit , unusual , physics , falling , sand , truck , wheel , position , rocket , travel , human , speed , obey ,
② 短语：work out , try out , Launch Pad , obey the rules , above all , drop in , as … as，as well , obey the rules , make sure
③ 句子: In most museums , there’s no shouting and no running.
