酸雨观测的采样过程包括降水采样桶的准备、取用、安放、采样和取回等步骤。
参考答案：对
根据句意及首字母提示完成单词。
1. Last year, we v______ many interesting cities.
2. My brother likes climbing m______.
3. I think the math t______ is very difficult.
4. — Do you often p______ English with your English teacher?
— Yes, I do.
5. — What did you do yesterday?
— Nothing. I s______ at home.
提出生物进化理论的科学家是( )
A．虎克
B．孟德尔
C．达尔文
D．李时珍
