2.They are useful,because they can use up the carbon bioxide.作者: 小钰钰 时间: 2011-8-6 21:24
does burning candle use up all air inside the glass?
they use up the CQ2,so they are very useful.作者: whitney0221 时间: 2011-8-7 10:55
1,燃烧的蜡烛会用尽杯里的空气吗?
the burning candle will use up the air in the cup?
2,因为他们消耗掉二氧化碳,所以他们非常有用。
they are very useful becuse they use up Co2作者: mapleleaf 时间: 2011-8-7 20:52
1.does burning candle use up some air inside the glass.
2.since they use up the carbon dioxide, they are very useful.作者: QWYH 时间: 2011-8-8 12:20
1,燃烧的蜡烛会用尽杯里的空气吗?
Will burning candle exhaust the air of the glass
2,因为他们消耗掉二氧化碳,所以他们非常有用。
they are very useful ,because they can consume carbon dioxide作者: captinjack 时间: 2011-8-8 15:59
1 will the burning candle use up the air in the cup ?
2 as they use up carbon bioxide,they are very useful .