2．What happened in the 3D printing industry last year?

　　A．The 3D printing technology was taken out of the factory.

　　B．The 3D printing technology began to be used in various fields.

　　C．The 3D printer was used for medical treatment for the first time.

　　D．The 3D printer became more affordable for consumers.

　　答案：D　细节理解题。根据文章第五段“Last year, though，saw a big change in the 3D printing industry—printers became much cheaper. For example, 10 years ago a desktop 3D printer might have cost ￡20,000, while now they cost only about ￡1,000, according to the BBC.”可知，去年的3D打印机变得很便宜了。

　　3．How is the last paragraph developed?

　　A．By giving examples.

　　B．By making comparisons.

　　C．By analyzing the cause and effect.

　　D．By presenting research findings.

　　答案：A　篇章结构题。根据最后一段中such as piracy和专家所说的话可知，本段使用了举例说明的方法。

　　4．What is the best title of the passage?

　　A．Great Demand for 3D Printers

　　B．Technology in the Future

　　C．Online Shopping Disappearing

　　D．Printing out Everything

　　答案：D　主旨大意题。本文主要讲述了3D打印机在未来的广泛使用能够改变人们的生活。

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