Four things are needed for a small rooftop garden. One thing is a roof that can ______. After about three weeks, the rooftop ga

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问题 Four things are needed for a small rooftop garden. One thing is a roof that can ______.
After about three weeks, the rooftop garden is ready for planting. Put the seeds directly into the ______.

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答案wet grass cuttings

解析 依据第三段的第二行,可得出答案。
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