题目

在短文的空格内填入适当的词，使其内容通顺，每空格限填一词，词首字母已给。Teenagers are always stressed out now. They are often too busy to think about their diets and exercise. The truth is, healthy eating, along with regular exercise. Is the only way to k___83_fit.During your teenage years, it is important to give your body the energy it needs. Teenager girls need about 2,200 calories(卡路里)a day and boys need a bit more. Doctors suggest 2,800 calories for teenage boys. 50% of your calories should come f  84  rice, bread, vegetables and fruit. You also在北方的冬季，常见的几种物态变化现象中，属于凝华的是（　　）A．室外冻冰的衣服变干B．房间窗户玻璃的内表面出现冰花C．湖面结了厚厚的一层冰D．正在跑步的人，口中呼出“白气”