In this task, you're given an article and an answer. Your task is to generate the question for the answer based on the given article.

Q: Article: Teenagers who spend hours in front of the television may have a poorer diet as young adults. A study,which included nearly 1,400 high school students,found those who watched TV for five hours or more per day had less healthy diets than peers five years later. Why does this happen? Should the parents take any measures? On the one hand,people who spend a lot of time in front of the TV, especially teenagers,may snack more,and that may affect their long-term diet quality. On the other hand,TV ads for fast food,sweets and snacks tempt teenagers to eat more of those foods. And TV time might also replace exercise time for some kids. Lead researcher Dr. Daheia J. Barr-Anderson,of the University of Minnesota in Minneapolis,told Reuters Health a clear correlation between TV time during high school and diet quality in young adulthood. While the heaviest TV viewers were eating the most junk food , those who'd watched less than two hours per day had the highest intake of fruits,vegetables, whole grains and high-calcium food. In her opinion,parents should limit and monitor TV viewing. As far as I am concerned,children should watch no more than two hours of television per day. And parents should set a good example by eating right,being physically active and their own TV time.
Answer: Teenagers' TV time may affect their diets later.

A: What's the best title for this passage?
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Q: Article: Imagine life without the Internet -- not being able to chat with your friends or look up information for your homework or research project. That is the reality for nearly two-thirds of our world's population, either because they cannot afford WiFi access or are located in remote, inaccessible areas. Now Google has decided to do something about that. Google's Project Loon will attempt to send balloons high up into our earth's atmosphere in 2015. Each balloon will be equipped with a mini computer and a WiFi radio that will send Internet signals over the places it is floating over. The network equipment on Google balloons will communicate with a special antenna attached to each user's home. These antennae are in turn connected to a local Internet Service Provider. Each balloon will also communicate with each other to hand over signals as one floats out of an area, and another floats in. The balloons are 15 meters wide and made of a material that is three times thicker than the plastic bag at the supermarket. This helps them defend themselves against cold temperatures and changing air pressure. Google balloons will circle the earth at a height of 20 kilometers-- in a layer of our atmosphere known as the stratosphere . This is higher than the altitude at which planes fly. Once the balloons reach the desired altitude after being released from the earth, they will ride on air currents. What keeps these balloons from flying away? They will be controlled by people at the Project Loon command center. A pump operating on solar power will fill the balloon with gas to raise it or let gas out to lower it, based on instructions. This allows the balloon to float on different air currents which are moving either clockwise or anti-clockwise. There is no doubt that this technology can bring education to many children, weather information to farmers, and communication to natural disaster areas. However, one big question remains -- will some countries be comfortable with balloons above their heads? There could be concerns about spying and other problems.
Answer: Helping us learn more about the earth's atmosphere.

A: What's the purpose of Google's Project Loon?
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Q: Article: Our plan was to drive into Cambridge, catch the 7:34 train to Liverpool Street Station, then to separate and meet again for lunch. We should have arrived at Liverpool at 9:19, but due to a typical London fog, the train had to move along so slowly that it was not until 10:30 that it got there. In spite of our late arrival, Joan, my wife's sister, decided that she would go to see the Crown Jewels in the Tower of London while we went shopping. It was only after her sister had disappeared into the fog that my wife realized that we hadn't decided where we should meet for lunch. Since I had our three tickets for the concert in my pocket, this was indeed a problem. There seemed to be nothing we could do except taking a taxi to the Tower of London, and try to find her there. Needless to say, we didn't find her. It was now one o'clock, and the concert began at 2:30. "Perhaps she will think of waiting outside the concert hall," suggested my wife hopefully. By this time the fog was so thick that road traffic had to stop, and the only way to get there was by underground railway. Hand in hand we felt our way along the road to where we thought the nearest station should be. An hour later we were still trying to find it. Just as I was about to lose my temper completely when we met a blind man tapping his way confidently through the fog. With his help we found Tower Hill tube station just fifty yards down the road. By now it was far too late even to try to get to the concert hall before the performance began at 2:30, so we decided to return to Cambridge. It took seven long hours instead of the usual two to make that journey. Nor were we able to get any food and drink on the train. Tired and hungry we finally reached home at ten, opening the door to the sound of the telephone bell. It was Joan; she had seen the Crown Jewels, had managed to get another ticket for concert, and had had a wonderful dinner at a restaurant near the hotel where she decided to stay for the night. Now she was ringing to discover whether we had had an equally successful day.
Answer: The writer didn't want to go to the concert.

A:
Why was Joan separated from her sister and her brother-in-law?
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