听一段材料，回答下面几个小题。
Where can you find national parks?
A.In the mountains.
B.In cities.
C.By rivers.
What do campers find in the national parks?
A.Forests.
B.Many elephants.
C.Many kinds of animals and plants.
What do campers enjoy most in the parks?
A.Hunting.
B.Skating.
C.A change from the busy life.
Where do most of campers stay in the parks?
A.In their cars.
B.In their tents.
C.In houses.