How many rows of piles are generally set up in freestyle skating competition? How many piles per row?
A. row 5 and 25
B. rows 2 and 18
C. rows 1 and 30
D. rows 3 and 20
What ground has Reuben Shaler invented indoor roller skates
A. cement
B. asphalt
C. floor
D. lawn
Who is the American inventor known as the father of modern roller skating?
A. Joseph merlin
B. pettiblad
C. walter nelson
D. James Leonard prmpton
What was first held at the roller skating field in Plymouth, England, in 1875?
A. roller skating stage play
B. roller skating competition
C. roller skating parade
D. roller skating dance