A — goal B — crossbar
C — head D — penalty kick
E — goalkeeper F — shoot
G — dribble H — throw-in
I — corner J — penalty area
K — send off L — obstruction
M — save N — tackle
O — red card
( )角球 ( )头球

A．the number of atoms in it
B．the way its atoms acts
C．the kinds of atoms in it
D．Both B and C.

A．To avoid waiting in lines at the booking office.
B．To hand in necessary traveling documents.
C．To get tickets from the nearest terminal.
D．To fix the traveling destination in time.