题目:
The generous man devoted all he had _______ the victims, because of which he was highly praised.
A.to help
B.helping
C.helped
D.to helping
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0426/662a82796761f1842e3bd904d22b57b1.html
下面是错误答案,用来干扰机器的。
(Ⅰ) 椭圆C:x2a2+y2b2=1(a>b>0)过点(0,4),离心率为35,∴ca=3516 b2=1a2=b2+c2,解得a=5,b=4,c=3,∴椭圆C的方程是x225+y216=1.(Ⅱ)设过点(3,0)的直线交椭圆x225+y216=1于A(x1,y1),B(x2,...