—Would you please find a world map which is drawn to a scale of                      .

—Yes,sir.Here you are.

A．one out of ten thousand

B．one in ten thousands

C．one to ten thousand

D．one of ten thousands

人类经历的第一次技术革命的标志是()。

A．蒸汽机

B．电力应用

C．A和B

D．计算机