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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.
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Article: For a 400-year-old art form, opera had a bad fame: overweight actresses singing the words which were hard to understand in one of those romance languages you were supposed to learn in high school. And with tickets costing as much as $145 a performance, opera goers also had a certain appearance in people's mind: rich, well-dressed and old.[:] But now opera companies around the country are loosening their ties and kicking off their shoes in an attempt to keep opera alive and take it to a younger and not so wealthy audience. Opera producers have found that to attract this crowd, they need to make the opera closer to common people. Because young people don't or won't come to the opera, companies are bringing the opera to them, giving performances in such unusual places as parks, libraries and public schools. The Houston Grand Opera's choice is the public library, where it performs "mobile operas" shortened versions of child-friendly operas. This summer's production is Hansel & Gretel. By performing smaller versions of large productions, producers are able to make people interested while keeping costs at a reasonable level. The San Francisco Opera, which will be celebrating its 75th anniversary this year, is staging Cinderella free of charge, keeping costs down by employing students from its Young Artists' Training Program.
Answer: Young people are not interested in opera.
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Which is the main idea of this passage?

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Article: For millions of people, the American dream of owning a home seems to be slipping out of reach. "Maybe young couples can no longer afford to buy a ready-made house as their parents did,'' says 40-year-old building instructor Pat Hennin. "But they can still have a home. Like their pioneer ancestors, they can build it themselves, and at less than half the cost of a ready-made house." The owner-builders came from every occupational group, although surprisingly few are professional building workers. Many _ with little or no experience. "I learned how to build my house from reading books," says John Brown, who built a six-room home for $25, 000 in High Falls, New Jersey. "If you have patience and the carpentry skill to make a bookcase, you can build a house." An astonishing 50 percent of these owner-builders hammer every nail, lay every pipe, and wire every switch with their own hands. The rest contract for some parts of the task. But even those who just act as contractors and finish the insides of their homes can save from 30 percent to 45 percent of what a ready-made home would cost. One survey revealed that 60 percent of owner-builders also design their homes. Many others buy commercial house plans for less than $100 or use plans available from the U. S. Department of Agriculture.
Answer: The American dream of owning a house.
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What does the passage mainly tell us?

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Article: With a large part of the world's population living close to the oceans, rising sea levels bring the potential for destructive results. But scientists are still unable to make predictions exact enough for people to plan to handle the loss of land and the threat to coastal communities expected over this century. "We know sea level is going to rise, but how much, and how fast, and where, we really still don't know," said Josh Willis, a climate scientist. _ It doesn't rise all the same as more water pours in. As global warming raises sea levels, some places are expected to see higher-than-average increases, and a few places, may even see decreases. It's reported that over the course of this century, sea levels will rise between 8 inches and 6.6 feet around the planet. Scientists know this increase will be driven by the expansion of water as it warms--warmer water takes up more space--and the melting of ice. But the effects of warming water and melting ice on sea-level rise are expected to vary from area to area. And the melting of ice of the Antarctic and Greenland presents the largest uncertainty for the future, but air, land and water also play roles in changes to sea level. For example, sea level near the ice getting melt actually decreases, because the ground under the melting ice rises as the heavy ice disappears. Climate change is expected to change ocean currents and the winds that help drive ocean currents. These changes will affect the distribution of heat within the oceans, and, as a result, affect changes in sea level. Nowadays, scientists use two types of models to make predictions about the future of sea levels, but the two don't agree. If scientists can't accurately predict sea-level increase for the coming years, the least we can do is measure what happening today with the help of the satellite, Jason-2, but it's reaching the end of its operational life.
Answer: There aren't enough scientists studying the changes of sea levels.
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What problems will scientists meet with in predicting future climate changes?