A．Because there are so many very people enjoying.
B．Because players can build up their body.
C．Because it is very fast, with lots of action.
D．Because the volleyball is interesting to watch.

A．Because the waves coming from the center of a quake can spread to these places.
B．Because there are the thickness of rocks making up the earth’s crust.
C．Because some parts of the earth are more likely to have quakes than others.
D．Because mountainous areas are easy to have earthquakes.