B．teenagers are lazybones

　　C．it's based on their body development

　　D．it's good for their learning and health

　　解析：细节理解题。根据最后一段最后一句的内容可知他认为青少年晚起是由他们身体的发展所决定的。

　　答案：C

　　B

　　At the middle school level，there are many academic clubs in which students can participate.Students can choose clubs that focus on an area of interest.

　　Mathcounts Club

　　Mathcounts tries to increase excitement towards mathematic achievement.It hopes to provide students with the foundation for success in science，technology，engineering and mathematics careers.Schools select individuals and teams to participate in competitions.Local competitions are held in February with winners progressing to state competitions and then on to the national level.Mathcounts works to challenge students' math skills，develop selfconfidence and give rewards for their achievements.

　　Envirothon

　　The Envirothon program focuses on natural resources knowledge and exposes students to diverse environmental issues，and ecosystems(生态学)．The ecology field competition for fivemember middle school teams offers competitions in wildlife，soil，forestry，and current environmental issues.Students work and learn in middle school clubs and can compete at the local and state level.

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