题目

阅读理解Sarah came running in. Look whatI found. Over the top of the paper I was reading came a crispy longobject that caused me to jump. It was a snake skin that had been shed by one ofour many garden snakes. Isn't it beautiful? said mywide­eyed seven­year­old. I stared at the organic wrapper andthought to myself that it really wasn't that beautiful, but I have learnednever to appear uninterested with children. They see only good quality andexcellence in the world until educated otherwise. Why does it do this? Sarahasked. Snakes shed their skin becausethey need to renew themselves， I某校组织学生到距离学校7千米的光明科技馆参观，学生小敏因没能乘上学校的包车，于是准备在学校门口改乘出租车去光明科技馆，出租车的收费标准如下：里   程收费（元）3千米以内（含3千米）8.003千米以外，每增加1千米1.8（1）写出小敏出租车的里程数与x千米（x≥3）时，所付车费的代数式；（2）小敏同学身上仅有14元钱，乘出租车到科技馆够不够？请说明理由．