Everyone has a family name. In China, the family name is the first name, but in English countries(国家)the family name is the last name. Do you know how English people get their family names? And what do they mean(意味着)? English people usually get their family name in these ways (方式).

    Some family names come from the places(地方)of their homes. A man live(住)on or near a hill, his family name may be (可能是) Hill. In England(英国), people's names may be Wood, Lake because they live near the wood or the lake.

    Some family names come from a person's job(职业). If a man is a cook, his family name may be Cook.

    And many people get their family names from their father's family names. If you hear(听到) the name "Jackson", you can know that he is the son of Jack.

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 “嫂”字是____结构，用部首查字法应查____部，再查____画，第三笔的笔画是____。

改革开放以来，我们取得一切成绩和进步的根本原因，归结起来就是（）
①坚持了马列主义***思想        ②形成了中国特色社会主义理论体系   
③开辟了中国特色社会主义道路      ④确立了中国特色社会主义制度 

设直线l的斜率为2且过抛物线$y^2=ax\left(a\ne 0\right)$的焦点F，又与y轴交于点A，O为坐标原点，若$△OAF$的面积为4，则抛物线的方程为(       )