that they may eventually reduce the amount of labor needed on construction sites by 90 per-cent.

A．Such construction robots are clever

B．So clever the construction robots are

C．So clever are the construction robots

D．Such clever construction robots are

2009年9月14日，我国（）航天发射场破土动工，这是我国航天事业发展史上的又一座里程碑。

A．太原

B．西昌

C．酒泉

D．海南