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  3. Four things are needed for a small rooftop garden. One thing is a roof that can

Four things are needed for a small rooftop garden. One thing is a roof that can

游客2023-10-04  66
问题 Four things are needed for a small rooftop garden. One thing is a roof that can ______. [br] They keep buildings cooler in the sun, so they ______. They can also extend the useful life of a roof.
选项
答案 save energy
解析 依据第五段的第二行，可得出答案。
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