题目

 完形填空（共15小题；每小题2分，满分30分） 阅读下面短文，掌握其大意，然后从21-35各题所给的四个选项中选出一个最佳答案。 Every person needs water and a diet of healthy foods. These foods should contain some fat, some fiber, a little salt and so on. People need energy  21 . They eat different kinds of food which change into energy. The energy is  22  in calories(卡). Even when you  23, you are using energy – about 65 calories an hour.  24  you are at school, or walking home, your body is burning up 100 calories an hour. When playing f1个葡萄糖分子有氧呼吸释放能量为m，其中40%用于ADP转化为ATP，若1个高能磷酸键所含能量为n，则1个葡萄糖分子在有氧呼吸中产生ATP分子数为 A．2n/5m          B．2m/5n           C．n/5m           D．m/5n