“春运”被誉为人类历史上规模最大的、周期性的人类大迁徙,为中国所特有。每当春节临近,什么困难都阻挡不住游子回家过年和祭拜祖先的步伐。与这种习俗和精神信仰密切相关的制度是( ) A.分封制 B.宗法制 C.礼乐制 D.中央集权制 答案:BEarth Day is celebration of life and our planet. It is a reminder that we need to________the world we live in and that we should learn to respect life and nature.A.care aboutB.think ofC.refer toD.watch out