A、A travel brochure. B、A lecture on medical tourism. C、A chapter of a medical textbook. D、A web page promotional material. D根据最后

With soaring healthcare cost and long waits for medical procedures, it is becoming increasingly difficult to find quality, affordable treatment. Whether you want cosmetic surgery of lifesaving procedures, you might have to dig deep into your wallet or wait several months before receiving the medical or dental care that you require, or you could try medical tourism and receive quality care for a fraction of the price and without the long wait.
    According to the National Coalition on Healthcare, more than 500,000 Americans traveled abroad to receive medical and dental work in 2006. And this is not an isolated trend. Every year, millions of patients from around the globe flock to some of the hottest medical tourism destinations in order to receive five star treatment at unbelievable prices.
    Experts predict that by 2013 medical tourism will grow to be a 100 billion dollar business with more than 780 million patients traveling abroad to receive care from foreign doctors, dentists and hospitals. These impressive figures don’t necessarily include the growing alternative healing sector either. With wellness spas and Ayurvedic healing on the rise, medical tourism is clearly a global steps required for a safe, enjoyable and successful health vacation to some of the world’s most popular medical tourism destination. We also invite you to participate in your growing online community by visiting the blog, forum, article and FAQ sections of the site. We realize that medical tourism can be a strange and daunting concept for many, the aim of helixm.com is to answer your questions, address your concerns and help you determine whether or not medical tourism is the best option for you. Take however long you need to explore. You absolutely do not want to rush into a decision like this. But when all is said and done, your medical bills, airfare and accommodations could end up costing less than whatever deductible than charges you would have to pay in your home country.
    Questions 21-25 are based on the passage you have just heard:
    21. What is the talk mainly about?
    22. Which of the following is not mentioned as one of the factors that make medical tourism attractive?
    23. From the talk, what do we know about alternative medicine?
    24. What is important for us to do before taking a medical trip, according to the speaker?
    25. What is the most likely source of this talk?