“ You can produce anything whenever and wherever you like . You don’t need to set up production lines for pieces that only need a limited amount of products . Setting up a production line is a lot of work . It takes a long time and is very expensive for a limited number of pieces , ” said Michiels .

　　Kim Francois , managing director of Materialise China , said their European and American clients have already taken the next step toward additive manufacturing with small series production such as hearing aids .

　　72. What is mainly talked about in the text ?

　　A. The development of 3D printing .

　　B. A 3D printing show in Shanghai .

　　C. Varieties of items printed in 3D .

　　D. The company Materialise NV .

　　73. According to Behrokh Khoshnevis , what is the main difficulty in printing buildings ?

　　A. Time .

　　B. Technique .

　　C. Space .

　　D. Material .

　　74. The example of 3D printed hearing aids was mentioned to show that ______________.

　　A. these items used to be impossible to make

　　B. 3D printing has a large market share

　　C. 3D hearing aids help people hear better

　　D. people need different sized hearing aids

　　75. According to the text , 3D printing is suitable for ___________ .

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