遗传和变异
参考答案：
是生物界最普遍和最基本的两个特征。遗传是指生物性状或信息世代传递的现象。变异是指生物性状在世代传递过程中出现的差异现象。
阅读短文，判断正(√)误(×)。
Lily is a nice girl. Every morning, she gets up very early. She makes the bed and cleans the room before
she goes to school. At 8: 00, she has breakfast at home. She has an English class at 9: 00. She likes English
very much. She is good at English. She has 3 classes in the morning. After school, she does her homework
quickly. Then she cooks dinner.
( ) 1. Lily gets up very early.
( ) 2. She makes the bed and cleans the room after she goes to school.
( ) 3. She has an English class at 9: 00.
( ) 4. She doesn't like English.
( ) 5. She often plays computer games after school.
一个圆柱体的底面积是28.26平方米，高是______，它的体积是84.78立方米．
