Air 　　Airisallaroundus.It'saroundusaswewalkandplay.Fromthetimewewereborn,airwasaroundusoneveryside.Whenwesitdown,itisaroundus.Weliveinair. 　　Alllivingthingsneedair.Livingthingscan'tlivewithoutair.Wecangowithoutfoodorwaterforafewdaysbutwecan'tliveformorethanafewminuteswithoutair.Wetakeinair.Whenweareworkingorrunning,weneedmoreair.Whenweareasleep,weneedlessair. 　　Weliveinair,butwecannotseeit. 　　Wecanonlyfeelit.Wecanfeelitwhenitismoving.Movingairiscalledwind.Howcanyoumakeairmove?Hereisoneway.Holdanopenbookinyourhandsinfrontofyou.Closeitquickly.Whatcanyoufeel?Whatyoufeelistheair.