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近日，路透社公布了一段3D打印房屋的现场画面。这栋在美国得克萨斯州休斯敦市的房屋是双层建筑，大约有371平方米。

开发商表示，3D打印建筑并不新鲜，但建造双层房屋需要满足更高的结构设计要求，他们和当地建筑工程公司合作两年完成设计工作，预计这栋房屋将在今年下半年建成。

高中课标词：

concrete [ˈkɒŋkriːt] n. 混凝土

element [ˈelɪmənt] n. 要素；元素；基本部分

阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。

A huge 3D printer is working to create what is believed to be the first two-story home ___1___(build) with the technology in the United States.

The home is ___2___(current) taking shape in Houston, Texas. The 3D printer is using concrete to produce the home, ___3___ will be about 371 square meters. Some parts of the home will also have wood ___4___(element).

Roberto Montemayor is the project leader for PERI 3D Construction. He said the large 3D printer operates in much the same way ___5___ the small printers used in homes and offices. But there are two main differences.

The first is that the home-building 3D printer can ___6___(expand) and changed to fit the needs of any size project, Montemayor said. ___7___ other difference is the material it uses. "We are printing here with concrete, which is a completely different material than plastic."

The home is expected ___8___(complete) in the second half of 2023. The builders say they hope the modern method can be used in the future to build even ___9___(large) housing structures. A growing number of American companies ___10___(begin) offering homes built with 3D printing technology in recent years. But so far, the homes being offered are much smaller.（“高中云英语”公众号原创命题）

A mock-up of the two-story home, created by the design office Hannah.

The project's design puts automated construction to the test with complicated features, like built-in shelving.

英语原文来源：VOA,NPR等