1. Four lines on a plane divide the plane into eight parts, then at most ( ) of these four lines are parallel.
A. 0
B. 2
C. 3
D. 4
【Answer】C
【Analysis】This is a pre-exam public question. When four lines are parallel to each other, they divide the plane into five parts. When three lines are parallel and the fourth line intersects them, the four lines divide the plane into eight parts. Therefore, choose $C$