It was a great day, ______ we did not enjoy it at the beginning.
A:and
B:but
C:or
D:then
A reptile has cold blood and ____(产卵) eggs.
若正比例函数y=mx(m≠0),y随x的增大而减小,则它和二次函数y=mx2+m的图象大致是( )
下列说法中正确的是( )