A：科学观察是科学探究的一种基本方法
B：科学观察必须借助有关工具才能进行
C：观察是要全面、细致和实事求是，并及时记录下来
D：观察时要积极思考，多问几个为什么
结尾一段的描写有什么含义？
A month had passed, but the government didn't find the________of the mine accident.
— Excuse me, Dad, but I'm going to the club to meet my friends in the football team.
— Ok. _____.
