Questions are based on the following pas...

1.D 2.C 3.A 【解析】 【原文】 When Christina answered an advertisement on social media, her sister warned her that she could have problems. The ad was a weekend vacation to an unknown destination. The West Virginia Division of Tourism organized the free trip earlier this month. The goal was to advertise West Virginia as a perfect place to visit during the autumn months. The social media ad said next to nothing about the destination. It only suggested that people wear layered clothes and strong footwear. It also recommended they have a sense of adventure. In parts of the United States, mystery trips have grown into their own industry. Whether traveling by bus, train or airplane, these vacations have different lengths, costs and destinations. Often, organizers give people a general idea about where they are going. But sometimes they do not. The group Christina went with enjoyed dinner, nature and horseback riding. They watched musical acts at a former general store and spent the night at Canaan Valley Resort. “I would absolutely do it again,” Christina said. “It got me out of my comfort zone. It’s part of the adventure.” Questions: What was the ad on social media probably about? What did Christina think of her experience? What is the passage mainly about?