具有相同运送能力而使旅客换乘次数最少的地铁路网布置方式是()。
A．单环式
B．多线式
C．棋盘式
D．蛛网式
参考答案：D
—____ is the population of the town?
—Over 20,000 .And a third of the population ____ workers of the car factory. [ ]
A. What; are
B. How many; are
C. What; is
D. How many; is
“支付方式”栏应填（）o
A．信用证
B．电汇
C．信汇
D．结交单
