题目

阅读下面的短文，并从下面的文本框中为本文选择恰当的段落大意。  Sports can help you keep fit and get in touch with nature. However, whether you are on the mountains, in the rivers, or on the grassland, you should know that your sport of choice might have great influence on the environment. ②    Some sports are resource-hungry. Golf, as you may know, eats up not only large areas of countryside, but also tons of water. Besides, all kinds of harmful things and a lot of energy are used to keep its courses(球场)，This leads to serious environmental prob15．已知二次函数y=a（x-2）2+c（a＞0），当自变量x分别取$\sqrt{2}$、3、0时，对应的函数值分别为y1，y2，y3，则y1，y2，y3的大小关系是y1＜y2＜y3．