人体从外界摄取的营养物质中，能够为人体提供能量的是( )。
①蛋白质②糖类③脂肪④维生素⑤水分⑥无机盐
A．②③⑥
B．④⑤⑥
C．①②④
D．①②③
答案：D
题目分析：食物中含有六大类营养物质：蛋白质、糖类、脂肪、维生素、水和无机盐，它们的作用不同，蛋白质、糖类、脂肪能提供能量，水、无机盐、维生素不提供能量．蛋白质是构成人体细胞的基本物质，蛋白质还能被分解，为人体的生理活动提供能量；糖类是人体最重要的供能物质，糖类也是构成细胞的一种成分；脂肪是人体内备用的能源物质，同时也参与细胞膜的构建；无机盐是构成人体组织的重要原料；水是细胞的主要组成成分，人体的各项生命活动都离不开水，人体内的营养物质和废物都必须溶解在水里才能进行运输．维生素对人体的各项生命活动有重要的作用．水、无机盐、维生素不提供能量．
For a few years, I have been wearing a ring on my right hand. It’s not always the ____ ring, but it’s always a ring that has ____ on it so that when I look at it, I’m ____ or reminded of something important. I have made a ____ of buying rings like this whenever I see one in a store. Sometimes I give them away as ____ to someone like Jennie. I first met Jennie in the ____ waiting room and we had talked several times. One night I sat down beside her and ____ how her son was doing because I knew that he was in very ____ condition. She told me that she didn’t know what to do more because it seemed none of the ____ from the doctors was good. They weren’t at all sure her son was going to ____ the accident that had hurt him so badly. With ____ in her eyes she said, “They’re ____ my hope.” I knew then that it was ____ just a coincidence(巧合)that I was wearing the ring that I had on that day. As she ____ to talk, I ____ slipped the ring off my finger and placed it in Jennie’s hand. I told her to wear it to remember that God loved her and He would be with her ____ all of this. ____ Jennie looked down at the ring, she got excited and then held it tightly, ____ the word written on the ring was “HOPE”. The last day I was at the hospital, I saw Jennie in the distance as I got on the lift. She ____ and held up the hand with the ring on it as she called out to me saying, “Look, I ____ have Hope!”
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