Flyer 1 flew(3.5meter) high(对括号部分提问）
2.Air pollution comes from smoke and bust (from power stations)(对括号部分提问)
3.The smell of flowers is sweet(保持原意)
人气：247 ℃ 时间：2020-01-29 01:14:20
解答
where the smoke and bust that cause air pollution come from.
the flowers smell sweet.
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