题目

任务型阅读 Expressing gratitude regularly is a wonderful habit to your children. In fact, studies have shown that people who feel gratitude on a daily basis are happier in general. Today we'll discuss ideas to help your children express their gratitude. Make a gratitude tree. Start with a large piece of craft paper and draw a tree trunk. Then ask the kids to paint or color it in brown. Each day ask your kids to think of something they're thankful for.And they'll have a gratitude tree full of leaves one day. Express your thankfulness to the ones you love.Print the photos in a 5'×7'size an下列关于蛋白质的叙述中正确的是(   ) A.蛋白质溶液中加入饱和的硫酸铵溶液，蛋白质析出，如果再加水也不溶解 B.蛋白质中的蛋白质分子能透过滤纸，但不能透过半透膜 C.重金属盐使蛋白质变性，所以吞服“钡餐”会引起中毒 D.蛋白质是组成细胞的基础物质，它是纯净物