根据短文内容，从下面方框中选择适当的词或词组填空。                       

     Chinese kung fu has already taken the central stage in the sports world.____ foreign pioneers are starting to learn it. They____ it because kung fu can nurse a person’s body and mind. By practicing it, people can find the peace from the heart and they can face the world more bravely____ . There are lessons for kids between 5 and 16 in more and more foreign Chinese kung fu schools. Kung fu can____ children's self-confidence. At the same time, they can learn to____ difficult situations with bad strangers.

①河水流淌。

②树结满果子。

③晓伟是学生。

④伽利略是科学家。

保护生物多样性的最有效的措施是（　　）

下图为某地2013年人口迁移与年龄关系统计图。读图，完成下列各题。