![](https://static.youtibao.com/asksite/comm/h5/images/m_q_title.png)
[主观题]
It‘ s a day to celebrate, a time to educate, and a way to make. a difference. Earth day wa
s first observed on April 22, 1970. The tradition began in the United States and is now an international focal point for people who are concerned about the environment.
查看答案
![](https://static.youtibao.com/asksite/comm/h5/images/solist_ts.png)