长1分米，宽4厘米的长方形，面积是请选择CBA2Q,S*n1v,Z(T,l。;f6}8[4_6A(m)R,\
A.4平方分米;f6}8[4_6A(m)R,\
B.4平方厘米;f6}8[4_6A(m)R,\
C.40平方厘米;f6}8[4_6A(m)R,\