如图,阴影的周长是____ cm,面积是____ cm2.
This is one of the happiest days ______ spent in my life.
长江流域水灾的多发地段是长江的
在下列事例中,属于有害摩擦的是( )
提示:
What's in the school?
How many…are there?
What can you do there?
My school