生活，像一个百宝箱，里面盛放着生活中的酸甜苦辣咸，有甜蜜的回忆，有温馨的留念，当然也有痛苦的回忆，内疚的片段。

请以“人，无论谁都有一两件感到后悔的事”，作开头，结合自己的切实生活感受，写一篇记叙文。

要求：（1）自拟题目；（2）以记叙为主，要写出真情实感；（3）全文不少于500字，不多于600字；（4）文中涉及的区域、单位、姓名，均用××代替，自己的姓名统一用“明明”代替，否则不给分。

已知$A,B$是双曲线$\frac{x^2}{4}-y^2=1$的两个顶点，点$P$是双曲线上异于$A,B$的一点，连接$PO$（$O$为坐标原点）交椭圆$\frac{x^2}{4}-y^2=1$于点$Q$，如果设直线$PA,PB,QA$的斜率分别为$k_1,k_2,k_3$，且$k_1+k_2=-\frac{15}{8}$，假设$k_3>0$，则$k_3$的值为（  ）

烟台市某居民欲购买一栋楼房，他相中了城郊一处依山傍海、远离闹市的花园式小区，他可能考虑的是该小区（　　）

    Who could have imagined that a treadmill（跑步机）on wheels would one day become a thing?!? Lopifit is an unusual means of transportation that allows you to power an electric bicycle by walking on a treadmill.

    Lopifit founder Bruin Bergmeester says it all started when he asked himself the question “How can I use a treadmill outdoors?” He finally came up with a new design, adding an electric motor, and the Lopifit was born. It's similar to an electric bicycle in that the motor only works when the rider puts power in as well. The Lopifit senses when you walk on the treadmill and uses the motor to turn a drive chain at the back of the treadmill, helping you reach a top speed of 17 miles per hour.

    To use the Lopifit, simply turn on the battery（电池）and use your foot to slide the treadmill backwards and start the motor. Then get on and enjoy the ride! If you need speed, just walk on the treadmill, and if you want to coast（惯性滑行）, all you have to do is stay still and admire the view. To stop, you have two hand breaks.

    The Lopifit first hit the streets in 2014 and, unsurprisingly, became a hit overnight. That was actually quite challenging for the company, because it started getting calls for orders, but it was nowhere near ready for mass production. The unique treadmill bicycle could be bought this year, and Lopifit is struggling to keep up with demand, although the price is up to $2,115.

    Some people consider this means of transportation stupid and unnecessary, although there is a very loyal fan-base of so-called Lopifitters. They simply believe that if you're going to walk, you might as well do it the old-fashioned way.

    But the Lopifit does have the special advantage of helping you “walk” really fast without much effort, or walking at cycling speed, if you will.