单项选择题
A.SUM(B1:B5) B.AVG(B1:E4) C.SUM(B1:B4) D.=SUM(B1:B4)
A.SUM(B3:D3) B.AVG(B3:D3) C.SUM(B3:B6) D.AVG(B3:B6)
A.AVERAGE B.SUM C.RANK D.COUNT