城市生态系统的功能包括生产功能、生活功能和______。
参考答案:还原功能
We may find that learning a foreign language does not have to be ____learning our mother tongue.
but can in fact be as easy. [ ]
A . twice harder as
B. as twice hard as
C. twice as hard as
D. as twice hard
建设项目总投资的计价依据,一般有:设备和工程量的计算依据;人工、材料、施工机械消耗量计算依据和( )。
A.国家经济政策规定
B.工、料、机价格依据
C.设备价格依据
D.利润税金计算依据
E.各种取费率、工程建设其他费用计算依据