下列图片可以反映建国后土地制度的变迁，在这一过程中，最主要的改变是

油炸食物不宜多吃，因长时间煎炸会产生有毒物质丙烯醛（C₃H₄O），根据丙烯醛的化学式你可以了解哪些信息？请说出三点：
（1）____ ；（2）____ ；（3） ____ 。

短文填空

Hi, Tony!

    I want to tell you a ____ my family. You know I have a sister and she is 13. She likes s____ and dancing. She is s ____ and p____. My father works h____. He is a doctor. He enjoys w____ TV, r____ books and talking w____ his friends. My mother a____ works hard. She is a teacher. She t____ Chinese. She likes cooking. My family has a car. We often go for a picnic.