判断升调和降调1.May I have a look?( )2.Is he a student?( ) Yes,he i

判断升调和降调1.May I have a look?( )2.Is he a student?( ) Yes,he is.3.What class are you in?( )4.Is it Tom's ball?( )5.How many bird are there in the tree?( )6.Can you spell your name?( )