Four things are needed for a small rooftop garden. One thing is a roof that can ______. When the plants are growing, they will

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问题 Four things are needed for a small rooftop garden. One thing is a roof that can ______.
When the plants are growing, they will need some liquid fertilizer. Also, seeds and new plants must be ______ and birds.

选项

答案protected from insects

解析 依据第四段的第三行,可得出答案。
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