下面各数，保留整数后是6的有 [ ]
A.5.499
B.5.5
C.6.49
D.6.5
BC
一块三角形的钢板，面积是1.95平方米，它的底是3米，高是多少米？
It was from John, ____ gave me a big key to _____ my dad.
A．who; understand
B．that; understanding
C．who; understanding
D．which; to understand
