A、Great weather. B、High-quality services. C、Family-friendly parks. D、Better prices. B文中说：美国的几大城市仍是最热门的旅游目的地。因为这些城市能够为游客提供优质的旅游服务

TripAdvisor is a website where people can write reviews about their travel experiences. There are also ratings for hotels, restaurants, and places people have visited around the world. Every year, TripAdvisor makes a list of the top 25 cities to visit in the United States. The results are based on the opinions of visitors to the website. America’s major cities are still the most popular destinations for visitors. This is because of the good quality of services they provide tourists. This year, TripAdvisor said the top five cities named were New York, San Francisco, Chicago, Las Vegas, and Orlando.
    Brooke Ferencsik of TripAdvisor said the top picks on the list were not surprising. And it’s no secret why New York City was named the number one destination. New York City is just the place that has it all, and travelers know that. It has world-class foods, accommodations, attractions and entertainment.
    New York City is sometimes called "the city that never sleeps" because it can be very busy. It is an exciting place for many people because there is so much to do. But the city might be too busy for travelers looking for rest and calm. They might want something more like Myrtle Beach, in the state of South Carolina, which made it to number 21 on TripAdvisor’s list.
    A lot of people come to Myrtle Beach for great weather, and it’s a wonderful family vacation spot. Along the beaches, there are a lot of family-friendly parks and water parks.
    Many people take time off from their jobs in the summer to travel. Because there are many tourists visiting other places, June until August is known as "high season." Traveling during the high season can be crowded. Hotels, restaurants, and transportation might also be very expensive. If you want to save money on a trip, it is a good idea to plan to leave before or after the summer months. These times are known as "shoulder seasons" for travel, being the fall or the spring. The weather is still very good in some of the destinations, and you can get better prices.
Q13: What makes America’s major cities popular destinations for visitors?
Q14: Which city is not among TripAdvisor’s list of the top 5 cities to visit?
Q15: Which period does the shoulder season refer to?