铁路运输是一种适宜于长距离运送客、货的现代化运输方式。读我图部分地区铁路分布图，回答以下问题。

已知圆的方程为$x^2+y^2-6x-8y=0$.设该圆过点$\left(3,5\right)$的最长弦和最短弦分别为AC和BD，则四边形ABCD的面积为（   ）

根据短文内容判断下列句子正误。

                                                                                                                 B

    One day, a little boy met an old millionaire and said. “I think I'm much richer than you.” The old man was greatly surprised and asked, “Why, my child?"

    “Do you know, time is money?” The boy asked.

    “Of course I do, but does it mean you are richer than me?”

     "Why not?" said the boy, “Now you see, I'm only ten years old and you are already seventy. If we both can live to 100, I still have 90 years to 90, while you have only 30 years. Time is money. Don't you agree I'm much richer than you?”

光滑斜面的长度为L，一物体自斜面顶端由静止开始匀加速滑至底端，经历的时间为t，则下列说法正确的是（   ）