A:ready helping
B:ready help
C:ready to helping
D:ready to help
I often play ping-pong ________ my friend.
成绩优异的小明待人高傲、自负,而且不关心集体,因此同学们都和他很疏远。小明要想获得同学们的友谊,不正确的做法是( )
如图,不能推出a∥b的条件是( )