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阅读下列短文，从每题所给的四个选项（AB、C和D）中，选出最佳选项，并在答题卡上 将该项涂黑。 Imagine having an idea, drawing it on paper, bringing it to a store and seeing it turned into a physical object．This is now possible with the help of 3D printers．Such machines were once used just by universities and big compaes．But now, stores with 3D printing services are appearing around the United States． Bryan Jayox and his wife opened The Build ShopLLC in Los Angeles two years ago．The store is filled with tools like a laser cutter, an industal sewing machine and 3D printers．Bryan Jaycox requires $ 15 an hour to print an object．He also charges a fee depending on the size of the object and up to $ 50 an hour for design and labor services． The Jaycoxs also offer 3D printing classes for anyone who is interested．One of the students in a recent class was Ki Chong Tran．He plans to open a 3D printing business in Cbodia．"The demand has been amazing．It's been much more than I would have imagined," said Ki Chong Tran． "I think 3D printing is going to be huge． It's going to make a huge impact on society as a whole," he added． Mr Jaycox predicts that within five years, 3D printing technology could become more consumer friendly． But Ki Chong Tran says even current technology can make a ifference m a developing country like Cambodia．"With 3D printing you can give them tools, and you put it in their hands so they are responsible more for their own development． They learn skills beyond just leaing English and becoming a tour guide or something like that or working at a bank．You can actually create things that give value to the world," said Ki Chong Tran． | 
