把一个表面积是54dm2的正方体木块锯成两个长方体，这两个长方体的表面积之和是[ ]
A.108dm2
B.72dm2
C.54dm2
答案：B
一个自然数的算术平方根是a，则相邻的下一个自然数的算术平方根是______．
The local people have ________ angrily to it that the factory put waste water into the river.[ ]
A．reacted
B．replied
C．contributed
D．answered
