目前在我国由于政府不能作为城市房屋的拆迁人，所以政府不能作为土地一级开发者。 ( )
参考答案：对
用边长相同的正八边形和正方形两种平面图形是否能进行密铺？如果能，请画出草图，说明铺法；如果不能，请说明理由.
Various efforts over the centuries _________ to predict earthquakes to reduce the damage.
A．are being made
B．have been made
C．were made
D．were being made
