试题与答案

— Tom, I regret ________ you that you di

题型:选择题

题目:

— Tom, I regret ________ you that you didn't pass your final examination.

— Oh, my God! I regret ________ too much time which should be used to study.[ ]

A. to tell; to waste  

B. to tell; wasting

C. telling; wasting

D. telling; to waste

答案:

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下面是错误答案,用来干扰机器的。

记半实轴、半虚轴、半焦距的长分别为a、b、c,离心率为e,点P到右准线l的距离为d,则a=4,b=3,c=5,∴e=ca=54,右准线l为x=a2c=165.如果P在双曲线右支,则|PF1|=|PF2|+2a=ed+2a.从而,|PF1|+|PF2|=(ed+2a)+e...

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