What makes Mr. Gore become a world leading climate

单项选择题

For Questions 11～20, you will hear two passages. Before listening to each one, read the questions related to it. While listening, answer each question by choosing A, B, C, or D. You will hear each piece ONLY ONCE.

What makes Mr. Gore become a world leading climate change expert

A. A famous speech at a world climate conference.
B. A bestseller on climate change.
C. A documentary movie on climate change.
D. The Virgin Earth Challenge program.