24级通用学术英语1讯飞4篇阅读理解练习_在线真题试卷与模拟练习_24级通用学术英语1讯飞4篇阅读理解练习_考试宝

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What does the underlined word “futile” in paragraph 2 mean?

Compared with dieting alone, what can we learn about the combination of dieting and exercising?

Why does the body’s compensation mechanism affect weight loss?

Why do people often stop exercising when they take it as a way to lose weight?

What is true according to the passage?

What do most sugar-free products have in common?

What can be inferred about artificial sweeteners?

Why do artificial sweeteners lead to weight gain and Type-2 diabetes according to the passage?

What does the author advise us to do?

Which of the following can be the best title for the text?

What is the main topic of the passage?

What is one major advantage of 3D-printed buildings mentioned in the passage?

Why is 3D printing considered more environmentally friendly?

According to the passage, what is a current challenge for 3D printing in construction?

What potential application of 3D printing is highlighted in the passage?

3D printing, also known as additive manufacturing, is revolutionizing industries far beyond its initial application of creating small plastic prototypes. The construction sector is now experiencing this transformative impact. This innovative technology enables the automated construction of buildings by depositing materials layer by layer, following a precise digital model or computer-aided design (CAD) file. The "ink" used is typically a specialized concrete mix or a composite material, extruded through a large nozzle mounted on a gantry, robotic arm, or crane. The advantages of 3D printing in construction are compelling and address several limitations of traditional methods. First and foremost is speed. The automated process can work continuously, significantly accelerating construction timelines. For instance, a basic, single-story house can have its walls printed in as little as 24 hours, a fraction of the time required by conventional bricklaying. Second, it promises substantial reductions in labor costs. While skilled personnel are needed to operate and maintain the equipment, the number of workers required on-site for manual tasks is greatly diminished. Third, it offers enhanced environmental sustainability. Because the printer deposits material only where it is needed based on the digital design, it minimizes waste generation almost entirely. This "additive" approach stands in stark contrast to traditional "subtractive" construction, which often produces a significant amount of debris from cutting materials to size. Despite its promising potential, the widespread adoption of 3D printing in construction faces several hurdles. The technology is still relatively undeveloped, and existing building codes and safety regulations were developed for conventional techniques. Consequently, these regulations have not fully caught up, creating bureaucratic challenges for obtaining permits for 3D-printed structures. Furthermore, while early buildings have shown good short-term performance, there are ongoing questions within the engineering community regarding the long-term durability, resilience to seismic events, and overall lifespan of these printed structures compared to those built with reinforced concrete and steel. Nevertheless, the potential applications are enormous and particularly suited to addressing urgent global needs. 3D printing could be deployed to rapidly provide safe, affordable, and durable housing in disaster-stricken areas or for low-income communities. It also holds promise for creating complex, customized architectural designs that would be prohibitively expensive or difficult to achieve with standard methods. In conclusion, while it is not yet a mainstream technology, 3D printing undeniably presents a promising future for the construction industry, championing unprecedented speed, cost-effectiveness, and a path towards greater sustainability.【缺少答案，请补充】

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