How many dimensions does a flat surface have? A zero B one C two D three 2. Why would it be unusual to find a 3-D printer in someone's home? A The printers are very expensive. B Most people prefer traditional printers. C There are no 3-D objects in a home. D The printers can be used only in a factory. 3. What could a person make using a 3-D printer? A a smartphone case B a pair of shoes C a pair of earrings D all of the above 4. What is special about a pair of shoes made with a 3-D printer? A The shoes are made in a factory. B The shoes can be custom-made. C The shoes may not fit well. D The shoes will last forever. 5. Which statement about the passage is a main idea rather than a detail? A It takes about two hours for a 3-D printer to create a smartphone case. B 3-D printers can make objects with a length, a width, and a height. C Most 3-D printers cost more than $1,000. D A traditional printer takes less than one minute to print