禹是通过“禅让”制而当上部落联盟首领的。大家推荐他的原因是（　　）

关于基因的叙述，错误的是（   ）

    Hi, my name is Sam. I have a big family. Charles is my father and Janet is my mother. I have two sisters. My sister Sara is 16. Anna is 14. I'm the youngest in my family. I'm 11.

    Hi, my name is Charles. My parents are Paul and Susan. I have one brother and one sister. Gary is my brother's son. My sister Laura has two daughters. They are Dina and Kate.

根据材料内容选择最佳答案。   

将抛物线y=2x²经过怎样的平移可得到抛物线y=2（x+3）²+4？（     ）