2013年1月份，北京多次陷入了严重的雾霾天气，空气能见度低，质量下降，给人们的生产、生活及身体健康带来较大危害。下列行为中不能降低或缓解北京雾霾天气发生的是（    ）

下列各组离子在溶液中能大量共存的是

如图所示是一种新近开发的固体氧化物燃料电池．它以掺杂氧化钇（Y₂O₃）的氧化锆（ZrO₂）晶体为固体电解质，在熔融状态下传导氧离子（O^2﹣），其中多孔电极a、b均不参与电极反应．下列判断不正确的是（   ）

鸟的气囊主要分布在____之间，同时也分布在____间．

听短文，在短文中填写所缺单词
    Tom is a____boy. He is eleven years old. He's two years younger than his____, Jim. Tom is 150cm and Jim is 160cm. Jim is 50 kilos and Tom is 60 kilos. Tom wants to lose some weight, so he tries not to eat too much____. He also____more exercise than____.
    ____morning he gets up earlier than Jim and he goes____for____minutes. He usually does it after school. After dinner, Tom often goes for a ____, and Jim likes____at home. Now Tom is much____than Jim. Jim thinks he____more exercise now. He and Tom will do exercise tighter.