听独白，回答问题。
（1）What does Ken Wells do？
A.An animal doctor.
B.A zoo keeper.
C.A volunteer.
（2）How many wild tigers are living in the world today？
A.100，000.
B.3，200.
C.100.
（3）Why are tigers in danger？
A.Hard to find food.
B.Poor weather conditions.
C.Easy to get ill.
（4）What is the purpose（目的）of this talk？
A.To tell facts about WWF.
B.To raise money for tigers.
C.To show the studies on tigers.