2、.序数词one---firsttwo---secondthree---third其余的序数词是由基数词后+th变化而来。Practise( ) 1.What____she buy then?She bought a cap .A is B did C does( ) 2.The book is very good. It _____we should eatvegetables.A says B said C sayingBAPractise( ) 3.The earth______around the
3、 sun.A went B go C goes( ) 4. My brother is interested______collecting stamps.A by B in C on( ) 5.Daming asked him______a paper spaceship.A to make B made C makeCBAExtension(拓展)thehistoryofChina'sspace中国航天史中国航天史是从1956年2月开始的,当时著名科学家钱学森向中央提出《建立中国国防航空工业的意