题目

阅读理解There's a new frontier in 3D printing that's beginning to come into focus: food. Recent development has made possible machines that print, cook, and serve foods on a mass scale. And the industry isn't stopping there.Food productionWith a 3D printer, a cook can print complicated chocolate sculptures and beautiful pieces for decoration on a wedding cake. Not everybody can do that—it takes years of experience, but a printer makes it easy. A restaurant in Spain uses a Foodini to re-create forms and pieces of food that are exactly the same, freeing cooks to complete other tasks. In an公差不为零的等差数列第2，3，6项构成等比数列，则这三项的公比为A.1B.2C.3D.4