Unit 6 学霸新视野时文阅读-【拔尖特训】2023-2024学年七年级上册英语 人教版

学霸新视野 时文阅读 ▶ “答案与解析”见P20 [热点素材](2023·原创) 新建筑材料“屎砖” Just think that one day your poop might help build greener homes. Are you surprised? Scientists are working on it! Today we use bricks to build houses. But when making bricks, lots of carbon dioxide(二氧化碳) comes out and polutes the environment. Scientists found that adding poop to bricks could cut down the polution. Using poop is good in other ways as wel. Greener and cleaner Every year, lots of human waste is turned into sludge. The sludge is rich in silicon(硅), aluminum(铝) and calcium. These things can be used to make bricks. Scientists tried to add different amounts of sludge to bricks. Too much sludge would make the bricks too soft. But mixing 15 percent sludge can make the brick strong enough. And this can cut down carbon dioxide emissions by 13 percent. Another good thing is that the germs in the poop stay in the bricks. They won􀆳t polute the land and rivers. More water-resistant(防水的) In some vilages in India, people mix cow dung and mud to make their homes water- resistant. Scientists found that the dung is rich in fatty acids(脂肪酸). It can prevent water from passing through the wal. Based on their study, the team made new kinds of bricks with cow dung. They are better than common bricks in water-resistance tests. They believe that human poop can do this, too! 1. What are the scientists working on? A. Using poop to help make bricks. B. Making more green areas in cities. C. Building clean houses without poop. D. Keeping carbon diox