Now children like to go to the fast food restaurant, as the name says,eating doesn't take much time.
A:where
B:such
C:that
D:and
责任产生于( )
如图是用火柴棍摆成的边长分别是1,2,3根火柴棍时的正方形,当边长为10根火柴棍时,摆出的正方形所用的火柴棍的根数为( )