Although they can see things far away, they have difficulties in reading a book unless they____hold it( )
A.at foot's length B.at thumb's length C.at arm's length D.at hand's length正确答案C
Although they can see things far away, they have difficulties in reading a book unless they____hold it( )
A.at foot's length B.at thumb's length C.at arm's length D.at hand's length正确答案C
