在山东省文登市环山街道办事处宋家沟小区，有一位名叫林基文的退休老教师，他20多年如一日地为小区义务修路、扫街，小区内的一条主路因此被大家称为“老林路”。材料中的林老师（ ）
①因为得到大家认可而实现了人生价值②通过为他人、为社会作贡献实现了人生价值③因为创造了价值而实现了人生价值④因为满足了他人和社会的需要而实现了人生价值
A：①③④
B：①②③
C：①②④
D：②③④
地沟油中含有一种强烈致癌物黄曲霉素B2（C17H14O6），长期食用会引起消化道癌变，关于黄曲霉素B2的说法正确的是（ ）
My name is Zhang Peng. I have a friend. His name is John. He has a grandpa and a grandma. They are seventy years old. They are at home. John's father works in a school. His mother is a doctor. John is a good student. They are very busy. They all get up early in the morning. John often helps his grandparents cook breakfast. There is a big garden and many young trees in front of his house. We can play games there. It's great.
有关声的利用可分为两类：____和____。外科医生可以用超声波除去人体内的结石，是利用了声波能传递____。中国传统中医用望、闻、问、切的方法检查病人，其中“闻”就是____的意思，它是利用声波能传递____。
