试题与答案

The generous man devoted all he had ____

题型:选择题

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:

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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,...

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