A:组织
B:器官
C:系统
D:个体
- I am out of breath. I can't go any further.- _______ ! I'm sure you can make it .
读某地地质剖面图,如下图,岩石产生的先后顺序是( )
— It's dangerous to swim here. Look at the sign.
— Oh, I notice it. Thanks for telling me.