_____ I could say a word, she had storme_爱下问搜题

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问题选择题

_____ I could say a word, she had stormed out of the room.

A. Before
B. When
C. After
D. Until

答案

答案：A

解答题

已知：△ABC为直角三角形，∠C为直角，A（0，-8），顶点C在x轴上运动，M在y轴上，

），设B的运动轨迹为曲线E．
（1）求B的运动轨迹曲线E的方程；
（2）过点P（2，4）的直线l与曲线E相交于不同的两点Q、N，且满足

，求直线l的方程．

选择题

—Excuse me, how can I get to the South Hill?

— Oh, ________ of these buses will take you there, you can only take a taxi.

A．all

B．both

C．none

D．nothing