题目

Everyone hopes to have a healthy lifestyle. But do you know what a healthy lifestyle is like? Here are some ways to have a healthy life.Get activeThis is the most important way of a healthy lifestyle. Walking, running, playing basketball and other sports will help you keep healthy.Keep cleanKeep the places around you clean. Unclean and untidy places can not only make you angry but also (不但…而且) make you ill.Eat healthilyOur health depends on (依赖于) our food, so everyone should remember to eat healthy food. The healthier food you eat, the healthier you will be.Live greenThis is th4．已知反比例函数的表达式为$y=\frac{k-1}{x}$，它的图象在各自象限内具有y随x增大而减小的特点，那么k的取值范围是（　　）A．k＞1B．k＜1C．k＞0D．k＜0