题目

    A．Why exercise?     B．Healthy eating     C．A picture of being healthy     D．Exercise tips E．The importance of being healthy F．A healthy combination 61．___________________________ You use energy for everything you do．That energy comes from the food you eat．Too much food or too little exercise causes your body to store the extra energy in fat cells．Lighten up on the food or increase your exercise and you might drop a few pounds．But if you exercise regularly and eat a healthy diet, you'll feel more healthy and strong as well as look great． 62．________求两条渐近线为x+2y=0和x-2y=0且截直线x-y-3=0所得的弦长为833的双曲线方程．