Our school has used computers in teaching for ten years. As a result, not only______, but students become more interested in their lessons.

A．has teachers’ energy been saved

B．saved was teachers’ energy

C．teachers’ energy has saved

D．was saved teachers’ energy

根据《YD5121-2010通信线路工程验收规范》，架空光（电）缆线路与公路交越时，最低缆线到路面高度为（）。

A.4.0m

B.4.5m

C.5.0m

D.5.5m