清洗液：20X浓缩洗液与蒸馏水或纯水按照（）的比例进行稀释，混合均匀，即为清洗液。
A、1：20
B、1：21
C、1：19
D、5：25
参考答案：C
根据句意写单词。
1. My father doesn't like playing sports, but he likes to _________ them on TV.
2. I don't like math. It's _________.
3. This question is _________ I can't answer it.
4. Edgarson has a great sports _________. He has so many balls.
5. My father goes to work every _________.
以下哪部是我国古代的地理学巨著( )
A．《水经注》 B．《太平广记》 C．《天工开物》 D．《梦溪笔谈》
