针对频发的校车安全事故，国家颁布了《校车安全管理条例》，赋予校车通行优先权，这一规定得到社会各界的高度评价。赋予校车优先权（    ）

①有利于保护学生的生命健康权                  ②是解决当前安全事故频发的唯一途径

③很好地体现了以人为本和对生命的尊重  ④是对未成年人实施社会保护的有效途径

    Mr. Lin has a store. It's next to No. 5 Middle School. It sells maps, books, pens, pencils, clothes and some other things. The things in his store are not expensive. Boys and girls like to go to his store. They like Mr. Lin because he is very nice. Mr. Lin likes the boys and girls, too. Mr. Lin has a “lost and found” box in his store. Look! A baseball, a ruler and some books are in the box. This box helps some boys and girls find their lost things. A sofa is in Mr. Lin's store, too. Boys and girls can sit there and read books after school. They can ask Mr. Lin questions about these books and he often helps them to find the answers.

读图回答下列问题

（1）写出A、B山脉的名称：A是____ ，B是____ 成为我国重要地理分界线的是____ （填字母），这条线和____ 毫米等降水量线基本一致；这座山以北冬季河流____ ，以南冬季河流____ （填“结冰”或“不结冰”）。
（2）属于我国最东端的点是____ （填序号），属于我国最西端的点是____ (填序号)，① 地比② 地降水多的原因是____ 。
（3）⑤⑥ 两地所在的温度带：⑤ 是____ ⑥是____ ，产生这种差异的原因是____ 。
（4）③ 和④ 的连线是我国最重要的____ ，这是我国著名的人口地理学家____ 先生1935年提出的。

苏维埃政权建立后，由于国内外反革命势力的联合反扑，苏俄政府被迫实行（    ）