Ⅰ. 根据语境和汉语提示写出正确的单词
1. Therefore, we need to protect our earth and fight against the disaster (灾难) together.
2. The effect of rainfall on landslide(滑坡)is a widely discussed topic.
3. We immediately(立刻)come to the rescue if any problems occur(发生).
4. It also looks into the reasons why volcanoes form and erupt(喷发).
5. Before some of you rush off on holiday, I do have one rather important announcement(宣布).
