分析 本文主要讲述了世界各国都存在的一个普遍现象--食物浪费,以及其会给社会带来的各方面的影响.
解答 29.B 细节题.根据文章内容 the timeworn advice of mothers everywhere may help reduce food waste from the farm to the fork,help the environment and make it easier to feed the world's growing population.由此可知,光盘行为不仅可以节约食物,而且还可以帮助减少食物浪费,减轻环境压力以及更容易使得整个上涨的世界人口得到粮食,结合选项,故选B
30.D 词义猜测题.根据文章内容Agriculture is the world's largest user of water,a big consumer of energy and major emitter of greenhouse gases during production.农业是这个世界上使用水最多的一种情况,在此期间,大量的能源会消耗以及大量的温室气体会产生,结合选项,故D符合文意.
31.A 推理题.根据文章内容,主要讲述了可持续的饮食方式,人们在外就餐时可以点足够吃的食物,但对于没有吃完的部分,应该打包带走,那样既不浪费也不污染环境,结合选项,故选A
32.B 推理题.根据文章最后一段内容In richer nations,fruit and vegetables end up in the trash because they aren't pretty enough to meet companies'standards,have gone bad in a home refrigerator or aren't eaten at a restaurant.In developing countries,much food spoils before it gets to market due to poor roads and lack of refrigeration.讲述到在发达国家和发展中国家都存在的食物浪费现象,由此下文应该会针对减少浪费这一话题而展开,结合选项,故选B
点评 本文是科教类阅读理解.做这类题材阅读理解时要求考生对文章通读一遍,做题时结合原文和题目有针对性的找出相关语句进行仔细分析,结合选项选出正确答案.推理判断题也是要在抓住关键句子的基础上合理的分析才能得出正确答案,切忌胡乱猜测,一定要做到有理有据
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Scientists claim to have developed a revolutionary new giant 3D concrete printer that can build a 2,500-square-foot house in just 24 hours.
The 3D printer, developed by Professor Behrokh Khoshnevis from the University of Southern California, could be used to build a whole house, layer by layer, in a single day.
"It is basically scaling up 3D printing to the scale of building," said Khoshnevis.
The giant robot replaces construction workers with a nozzle (喷嘴), which can quickly build a home based on a computer pattern, MSN News reported.
Contour Crafting, as it is named, is a layered fabrication (构造) technology. Using this process, a single house or a colony of houses, each with possibly a different design, may be constructed in a single run, embedded (嵌入) in each house all the wires and pipes for electrical, plumbing and air-conditioning.
The potential applications of this technology are far-reaching including in emergency, low-income, and commercial housing.
"Our research also addresses the application of Contour Crafting in building habitats on other planets. Contour Crafting will most probably be one of the very few feasible approaches for building structures on other planets, such as the Moon and Mars, which are being targeted for human habitation before the end of the new century," researchers said on the project website.
The technology may potentially reduce energy use and emissions. And the main advantages of the Contour Crafting process over existing technologies are the superior surface finish that is realized and the greatly increased speed of construction.
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