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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: China's auto production is expected to grow by 20 percent in 2005 to 6 million vehicles , possibly passing Germany as the world's No. 3 producer. China is the world's-fastest-growing auto market as rising incomes make it possible for millions to buy their cars. Foreign automakers are investing billions of dollars in expanding production in China. Germany produced 5.5 million vehicles in 2004, the No. 3 producer behind the United States and Japan. London is quickly becoming a major cycling city after the terrorist ( ) bombings on London's subway and bus system July 7, which killed 52 people. London Mayor Ken Livingstone wants to increase cycling 80% by 2010. "Cycling is the fastest, cheapest, most healthy and environmentally friendly way to get around London, and more and more people are taking it up," Livingstone said. "The number of cyclists has doubled over the last five years, while those killed or seriously injured has fallen by 40%." Under the London Cycling Action Plan, Livingstone hopes to make London a world-class cycling city to reduce congestion and pollution. London now has 273 miles of bike roads, half built since 2000. The goal is 560 miles by 2010.
Answer: Because Chinese are getting higher incomes.
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Why is China the fastest-growing auto market?

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Article: The Apple iPhone's impact was widely evident at the Consumer Electronics Show, as new touch-screen devices could be found everywhere. The consumer electronics industry came unbuttoned in Las Vegas this week. At the annual Consumer Electronics Show, companies from around the world many devices boasting (...) touch - sensitive technology, rather than traditional push-button controls. Motorola, Sony, and LG Electronics all showed off touch-screen phones this week. Microsoft Chairman Bill Gates praised and offered a touch-screen computer, the Surface, related to a flat panel TV for a tabletop. Even camera makers, such as Kodak,included touch-screen LCDs in their devices. Touch-screen tech has been in use for years,but the push to develop and weave it into consumer electronics gathered steam with the June introduction of Apple's iPhone. "The touch-screen industry is really getting hot," says Jennifer Colegrove, a senior analyst at iSuppli. "Since the iPhone came out, there are a lot of companies that did not have a relationship with touch screens before that decided, 'OK, I want to make a touch screen, too.'" The touch-screen tech ecosystem now includes more than 100 companies specializing in everything from smudge-proof screens to sensors able to detect fingers before they even contact the screen. Sales of leading touch-screen technologies,such as those used in mobile phones and navigation devices,are expected to rise to $ 4.4 billion in 2012, up from $ 2.4 billion in 2006,according to iSuppli estimates.
Answer: The Apple iPhone was popular.
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What did the writer think about the Apple iPhone?

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Article: A study made by University of Sussex found that men and women who frequently used several types of technology at the same time had less grey matter in a key part of the brain . The researchers said : " Simultaneously , using mobile phones , laptops and other media devices could change the structure of our brains . " Worryingly , the part of the brain that shrinks is involved in processing emotion . The finding has linked multi-tasking with a shortened attention span , depression , anxiety and lower grades at school . The researchers began by asking 75 healthy men and women how often they divided their attention between different types of technology . This could mean sending a text message while listening to music and checking email , or speaking on the phone while watching TV and surfing the web . The volunteers were then given brain scans which showed they had less grey matter in a region called the anterior cingulated cortex ( ACC ) . The findings held even when differences in personality were taken into account . The study , published in the journal PLOS ONE , is the first to make a link between multi-tasking and the structure of the brain . Researcher KepKeeLoh said : " Media multi-tasking is become more popular in our lives today and there is growing concern about its impacts on our cognition and social-emotional well-being . " He added that more researches are needed to prove that multi-tasking shrinks the brain . This is because it is also possible that people with less grey matter in the ACC are more likely to use lots of devices simultaneously . Scientists have previously described brain structure can be altered on prolonged exposure to new environments and experience . Other studies have shown that training - such as learning magic or taxi drivers learning the map of London - can increase grey matter densities in certain parts .
Answer: The decrease of grey matter in the ACC affects emotion .
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What can we learn about grey matter from the passage ?