A：V3＞V2＞V1
B：V3=V2=V1
C：V1=V2＞V3
D：V3＞V2=V1
My mother often tells me the teacher in class .
_____the scientists have done lots of research on Mars, there is still much waiting to be discovered.
74.1除以3.8乘2.6的积，商是（ ）
