题目

 With more than 17000 islands, _____ only 6000 are inhabited, Indonesia is the world’s largest archipelago (岛国).        A. on which    B. for which   C. of which    D. along which 答案：C在下列物质中，属于人体内环境组成成分的是（ ）①血红蛋白②葡萄糖③二氧化碳④钠离子⑤血浆蛋白A．①②③ B．①④⑤ C．①③④ D．②③④⑤