听下面一段对话,完成第1至4题。 1. When did Brian climb Mt. Everest? A. At the age of 13. B. At the age of 14. C. At the age of 15. 2. How many people climbed the mountain with Brian? A. 2. B. 3. C. 4. 3. What did they do before they climbed the mountain? A. They had some physical examinations. B. They took some training. C. They bought some high- tech equipment. 4. What impressed Brian deeply at the top of the mountain? A. The view of the other mountains below. B. The amazing snow scenery. C. The blue sky within reach.