短跑高手不见得都能驰骋在长跑跑道上；跳水健将未必在水里游刃有余，如果你没有认识自己，就注定会输。可见 （     ）
①每个人都有自己的长处和短处 ②必须正确处理个人和集体的关系 ③正确认识自己要全面地对自己做出评价 ④正确认识自己有利于自身的发展 

如表是某校女子排球队队员的年龄分布：

则该校女子排球队队员的平均年龄为 ____岁．

根据短文内容，选择正确答案。

    Peter always doesn't know the way. His friends often laugh at him. They say he needs a map to find the bathroom in his own house. In his eyes, every street looks the same, and he doesn't know which way to go. Sometimes he has to take a taxi home because he can't remember the way to his house.

    Peter watches a lot of films and reads a lot of books about animals. Each bird knows which way is south. Bats (蝙蝠) can fly at night and find their way with their ears. He feels embarrassed (困窘的) because all these animals have a good sense of direction. He tries to find his way with the help of stars in the sky. There is a star called the North Star, and he knows how to find it.     Of course, Peter's friends are still laughing at him, because he can only see the North Star outside when it is sunny at night. He can't tell the directions in the daytime or when he is inside or when it is cloudy.