In the past my hometown was used to be a beautiful place. Thick trees and green grass could be seen in everywhere. In order to build house and grow more crops, people cut down more and more trees. With time went on, the whole forest was almost destroyed. Gradually the green hills have changed into wasteland. As a result, sandstorms struck us now and then, of which we suffer a lot. However, I do hope all the people should realize the terribly result of not caring about our environment. What's more, they should take good care of the forests and plant trees instead cutting them down to improve our living conditions. 

将不属于生产经营主要设备的物品作为固定资产进行管理应具备的条件是（）。

A．单位价值在1000元以上，并且使用期限超过1年

B．单位价值在1000元以上，并且使用期限超过2年

C．单位价值在2000元以上，并且使用期限超过1年

D．单位价值在2000元以上，并且使用期限超过2年