民俗说：“龙生龙，凤生凤，老鼠生儿会打洞．”这说明了生物的（  ）

    There will be many changes in our life in the future. We will____ flying cars to work. We will travel to ____ . Maybe we will ____ live in space. Students won't ____  schoolbags to go to school any more. They will learn on ____ at home. And there will be robots in our home. The robots will help us do all the housework. Life will be great at that time.

1）快餐在中国十分流行，人们，尤其是儿童和青少年喜欢吃快餐。

2）快餐受欢迎的原因；

3）从营养角度讲，快餐食品却不尽人意；

4）你的建议

参考词汇：营养(nutrition)

注意：

1）词数100左右；

2）可以适当增加细节，以使行文连贯。