决策阶段的资源投入大约占工程项目总的资源投入量的( )。
A．1%～2%
B．1%～2.2%
C．1%～2.5%
D．1%～3%
参考答案：D
比较大小（用”＞”或”＜”表示）：-（-1）______-（+2）
While building a tunnel through the mountain, ________ .
A．an underground lake was discovered
B．there was an underground lake discovered
C．a lake was discovered underground
D．the workers discovered an underground lake
