The hot air makes the balloon stay up(划线提问) The hot air 划线

问题描述:

The hot air makes the balloon stay up(划线提问) The hot air 划线

What makes the balloon stay up
问物用WHAT
翻译:什么使气球保持上升?
加油!不明白再问!能告诉下 做这题的理由吗根据所问的词来决定疑问句,如问物用WHAT,问时间用when / what time ; 问地点用where ; 问主语(人)用WHO; 问原因用why 等