为了保护臭氧层，可采取的措施是（　　）

    I'm Chinese ，but I am in England now. I can speak English. But I sometimes make mistakes with English. It was sunny yesterday. My class went to the park. I said，“Let's fly cats in the park. ”My classmates all laughed. I didn't know why. Then my teacher said，“Cats are animals. We can't fly them. But we can fly kites. ”“I know my mistake. I wanted to say kites，not cats. ”I said. Then we laughed again. That was funny.

2014年10月1日是新中国成立65周年纪念日，建国65年以来，特别是改革开放以来，取得了举世瞩目的伟大成就。这告诉我们（     ）