Questions 11 to 18 are based on the conversation you have just heard.

A．Climbers have the opportunity to be outside and enjoy the scenery.
B．Climbing isn’t as expensive as other sports.
C．Learning to climb doesn’t take a very long time.
D．Climbers develop skills useful in other activities.

A．use telecommuting methods to contact friends
B．cook at home instead of outside to avoid air pollution
C．integrate the function of working and living for their home
D．forbid driving within the sustainable communities