“百善孝为先”。我国历来把“孝”看成是“天之经也，地之义也，民之行也”，因为孝敬父母是（    ）

①中华民族的传统美德           ②公民必须履行的义务

③社会主义的道德规范           ④为人做事的唯一准则

    Hi, I'm John. There are four seasons in a year. I like them all. In spring, it's warm. There are pretty flowers everywhere. I often go on a picnic with my parents. Summer is hot. I often go swimming in the pool. I like to wear my sunglasses. In fall, the weather is cool. I can help my grandpa pick apples. Winter is white. I can make a snowman. And I can go skating, too.

下列洲界线中不属于亚欧分界线的是（    ）