第一节
听下面3段对话，从A、B、C三个选项中选出最佳选项。
What does the woman do now

A．to tell people how serious the damage caused by landslides is
B．to tell people that sending workers to stabilize mountainsides is a risky job
C．to introduce a product that can be used to stabilize mountain-sides
D．to show people how to use a new product