[音频]B) Its top is hidden in clouds of volcanic smoke.C) Its height changes with each volcanic eruption.D) It has a recorded history of 1500 years.2. (17). A) The are now a tourist destinations.B) They attract a lot of migrating birds.C) They provide shelter for the farmers.D) They make good fileds for farming.3. (18). A) They nest on the volcano's slopes.B) They feed on certain small mammals.C) They compete with each other for food.D) They match large mammals in strength.