【单选题】某二叉树的前序遍历序列为 ABCDE ,中序遍历序列为 CBADE ,则后序遍历序列为
【单选题】—The earth goes round the sun. —What did he say? I couldn't hear him. —_________. [ ]
A.
He says the earth goes round the sun.
B.
He said the earth goes round the sun.
C.
He said the earth went round the sun.
D.
He says the earth went round the sun.
【简答题】He told his pupils that the earth (move) ______ around the sun.
【简答题】如图,抛物线y=x 2 +bx+c过点A(﹣4,﹣3),与y轴交于点B,对称轴是x=﹣3,请解答下列问题: (1)求抛物线的解析式. (2)若和x轴平行的直线与抛物线交于C,D两点,点C在对称轴左侧,且CD=8,求△BCD的面积. 注:抛物线y=ax 2 +bx+c(a≠0)的对称轴是 .
【简答题】如图,抛物线y=x 2 +bx+c过点A(-4,-3),与y轴交于点B,对称轴是x=-3,请解答下列问题: (1)求抛物线的解析式. (2)若和x轴平行的直线与抛物线交于C,D两点,点C在对称轴左侧,且CD=8,求△BCD的面积. 注:抛物线y=ax 2 +bx+c(a≠0)的对称轴是x=- b 2a .
【简答题】A.He is down-to-earth. B.He is aggressive and optimistic. C.He is discouraged by his failure. D.He is confident about achieving a real first.
【简答题】任正非.docx 问题:分析以上材料,谈谈你对我国教育进行改进的看法,不限字数。
【简答题】The lover of nature is he whose intercourse with heaven and earth becomes ______.