第11题: [单项选择]{{B}}Questions 1 to 5 are based on the following conversation.{{/B}} A. (A) They are a group of astronauts. B. (B) They are several scientists who are interested in the moon. C. (C) They are a group of scientists and engineers who study Mars. D. (D) They are NASA staff. 参考答案:C 答案解析:[听力原文]1-5
Woman: Tell us more about this "Mars Underground." Who are they, what have they been doin