Although ,he insisted _________going there together with us.
A. to
B. on
C. at
D. for
The first question we now discuss is _______ we should go there so early tomorrow early tomorrow.
A. whether
B. where
C. what
D. whom
在一个图中,所有顶点的度数之和等于图的边数的( )倍。
A. 1/2
B. 2
C. 4
D. 反对顶点