Flyer 1 flew(3.5meter) high(对括号部分提问)
问题描述:
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)
答
where the smoke and bust that cause air pollution come from.
the flowers smell sweet.