Complete the notes below. Write ONE WORD AND/OR A NUMBER for each answer. The Underground House Design

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问题 Complete the notes below.
Write ONE WORD AND/OR A NUMBER for each answer.
                        The Underground House
Design
    Built in the earth, with two floors
    The south-facing side was constructed of two layers of【L33】______
    Photovoltaic tiles were attached
    A layer of foam was used to improve the【L34】______of the building
Special features
    To increase the light, the building has many internal mirrors and
    【L35】______
    In future, the house may produce more【L36】______than it needs
    Recycled wood was used for the【L37】______of the house
    The system for processing domestic【L38】______is organic
Environmental issues
    The use of large quantities of【L39】______in construction was
    environmentally harmful
    But the house will have paid its ’environmental debt’ within【L40】______
【L39】

选项

答案concrete

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