由长方形的周长公式可得，长方形的周长=（长+宽）×2．
故选B．
对下表信息的理解正确的是
A．抗战初期正面战场的情况
B．国民党片面抗战的恶果
C．抗战相持阶段国民党消极抗战的恶果
D．国民党战场开始了战略反攻
She wants to study English and she's going to study French ______.[ ]
A. at a time
B. at times
C. in the same time
D. at the same time
