In this task, you're given an article and an answer. Your task is to generate the fill-in-the-blank question for this answer based on the given article. The blanks are always at the end of the question, and can be filled with more than one word or phrase.
One example is below.
Q: Article: Homework can put you in a badmood , and that might actually be a good thing. Researchers from the University of Plymouth in England doubted whether mood might affect the way kids learn. To find out the answer, they did two experiments with children. The first experiment tested 30 kids. Someshapes were hidden inside a different, larger picture. The kids had to find the small shapes while sitting in a room with either cheerful or sad music playing in the background. To test their mood, the scientists asked the kids to point to one of five faces, from happy to sad. Children who listened to cheerful music tended to point to the smiley faces while the others pointed to the unhappy ones. The researchers found that sad kids took at least a second less to find the small shapes. They also found an average of three or four more shapes. In the second experiment, 61 children watched one of two scenes from a film. One scene was happy, and the other was sad. Just like in the first experiment, kids who saw the sad scene acted better compared to the others. The researchers guessed that feeling down makes people more likely to focus on a problem or difficult situation. Not all scientists agree with them, however. Other studies argued that maybe, that cheerful music in the first experiment distracted kids from finding shapes. While scientists work on finding out the answers, it still might be wise to choose when to do your tasks according to your mood. After eating a delicious ice cream, for example, write an essay. 
 Answer: whether mood affects their learning ability
A: Researchers did experiments on kids in order to find out _ .
Rationale: It is clearly mentioned in the article that to the check effect of mood on children is the main purpose of the experiment.
Q: Article: Ice climb in London The huge ice skating area at Somerset House has been drawing crowds each winter for years, but last November an ice wall was added for the first time, bringing even more danger and excitement. Standing more than 26 feet high is a long line of pure ice, featuring three climbing faces of varying difficulty using crampons  , ice picks and ropes. Using it costs about PS40 (020 78454600; www.somersethouseicednk.org.uk). It is open from late November to the end of January. Hang-gliding   in Rio De Janeiro According to the hang-gliders of Rio, once you've swooped   over the city's streets, gazing at the Sugar Loaf, and the city of Niteroion, the other side of Guanabara Bay, you will understand why birds are peaceful animals. Accept the romantic idea on a 30-minute cycling flight from the 525-meter Pedra Bonita in the Sao Conrado mountain down to the Sao Conrado beach. It costs around PS55. Contact Air Adventures (00 21 9843 9006; www.riohanggliding. com). Skywalk in Sydney This experience takes having a look at a nice view to the whole other level, as you are suspended more than 850 feet (260 m) above street level, controlled to a glass viewing platform of Sydney Tower. It's the city's highest building. After a thorough briefing and being fitted with protective skysuits, skywalkers make their way along two-purpose-built walkways and platforms, which have transparent floor, while a guide points out landmarks. Night time skywalks are also available. It costs PS46. Mountain boarding in Leeds Riders roll down hills and fly off jumps, doing tricks. A number of special mountainboard parks have opened around the country (see www. ridethehill.com). But the Leeds body of the Boarding Society practice at least twice a week in the city in locations that include Roundhay Park. Those with their own boards are welcomed to join them. Contact the society at www.scuz.info. Alternatively, beginners can get lessons in Halifax at the Another World (01422 245196; www. Mountain boarding.co.uk) mountainboard center for PS8 an hour, with equipment. 
 Answer: offer some ways to experience extreme sports
A:
The purpose of the above ads is to   _  .