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Question 3: They design and carry out projects aiming to reduce fossil fuel consumption, find renewable fuels for public transport, and promote other clean air efforts.
 
A. inexhaustible B. recyclable C. green D. environmentally-friendly
 
Question 4: . The urban planners are working for Eco Infrastructure Network, whose main function is to deal with urban environmental problems to make Super Star City greener, cleaner, and more sustainable.
 
A. eye-catching B. developed C. long-lasting D. friendly