He didn't understand French, so I offered to _____ for him.
A:report
B:provide
C:translate
D:realize
单项式﹣2xy3的系数与次数分别是( )
将矩形添加一个适当的条件:____ ,能使其成为正方形.
若要查阅孔子的言论,应从以下什么书入手 ( )