按要求写句子。
1.雪花从空中飘落下来。(扩句)
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2.好一幅北国寒冬瑞雪丰年的图画!(改成反问句)
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3.气象台发布了强大的冷空气即将南下的消息。(缩句)
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4.大雪纷纷扬扬地从半空中降落下来了。(改成比喻句)
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