题目

下列有关组成细胞的化合物的叙述，正确的是（    ） A．位于细胞膜上的糖类全部构成糖蛋白，参与细胞识别 B．磷脂与核酸的组成元素相同，原核细胞中不含有磷脂 C．脱氧核糖不能水解，原核细胞的遗传物质彻底水解后可获得脱氧核糖 D．蛋白质彻底水解形成的氨基酸与双缩脲试剂反应呈紫色 答案：CA. give up B. problem C. play with D. believe in E. smileLife doesn’t always give us the joy we want. We don’t always get our hopes and dreams, and we don’t always get our own way. But don’t 【1】 hope, because you can make a difference. Always look for the beauty around you, in nature, in others, in yourself, and 【2】 the love of friends and family. You can find love in a 【3】 or a helping hand. It is all around, if you just look for it. Give love, for in giving it you will find the power in life along with the joy, happiness, patience, and understanding. Even when you feel as though there isn’t a lot you can do to change unhappiness or a 【4】, you can always do a little, and a little at a time finally makes a big difference.