如图,已知圆的半径是5,弦AB的长是6,则弦AB的弦心距是( )
A:3
B:4
C:5
D:8
一个自然数的平方根为a,则它的相邻的下一个自然数的算术平方根是( )
Christine is selling her house, but on ______ other hand she doesn't want to move.