生物学是研究____和生命活动规律的科学．

根据动物行为的功能判断下列几种动物的行为类型：

（1）两只蟋蟀争斗，其中一只咬断了另一只的腿．属于____ 行为．

（2）蛇呑蛋，属于____行为．

（3）荧火虫通过发光来招引异性，属于____ 行为．

（4）蜥蜴在被捕食者捕捉后往往自断尾巴以逃脱，属于____行为．

（5）蟑螂白天休息，晚上出来活动，属于____ 行为．

某同学想去美国留学，他首先应过好下列哪种语言关（   ）

    Hi. My name is Betty. I'm from Canada. I'm a student. I'm in Class Two, Grade Five. There are four people in my family. They are my father, my mother, my brother and me. My father is an English teacher. He works at a school. My mother is a doctor. She works in a hospital. My brother is a student, too. He is in Class Two, Grade Three. I love my family.