Unit 5 第4课时 Assessing Your Progress & Video Time（Word）-【全效作业本】2022-2023学年高中选择性必修第一册英语同步课件及教参（人教版2019）

第4课时　Assessing Your Progress & Video Time [见学生用书P78] Ⅰ.阅读理解 Salads of the future may still be served in bowls，but their ingredients might be grown in skyscrapers.That's the hope of scientists and architects who are setting up a unique plan to feed an increasing population on a planet with limited farmland. “In another 40 years，there'll be another three billion people.That's the problem，” said Dickson Despommier，a professor of public health at Colombia University.One solution is to grow everything from salad grains to main grains year­round in high­rise buildings at the hearts of urban centres.This so­called vertical(垂直的)farming could put food within easy reach for billions of people while reducing carbon emissions(碳排放)from shipping crops across continents and oceans. “It is based on technologies already in use throughout the world，mainly high­tech greenhouses，” Despommier said.For example，many existing greenhouses use hydroponics，a technique for growing crops in smaller spaces using water instead of soil. But for now high­rise farming remains just an idea.One challenge is how to build the greenhouses so that layers of crops get enough light to be grown in a vertical structure.Despommier says that architects are already designing buildings to harvest the maximum amount of natural light.What's more，by using new energy sources such as hydrothermal power(水热能)and wind power，these buildings don't necessarily have to look like skyscrapers. Another consideration is creating a vertical farm design that would be economically practical.Despommier said he was particularly interested in Eco­Laboratory.It would be just 12 stories tall and would mix houses with gardens that produce food for the local neighbourhood. “This was an attempt at something that seemed practical to a developer，” said project designer Myer Harrell.People might tend the crops，or they might assign the work to outside agricultural firms and later purchase the crops at a local market. Harrell believes breaki