建筑产品的时代性和社会性决定建设工程环境管理的( )。
A．全面性和协调性 B．复杂性和特殊性C．多样性和经济性 D．多样性和单一性
参考答案：C
The Smiths are considering _____ to New England because they _____ the cold weather there. [ ]
A. not moving; didn't use to
B. not moving; aren't used to
C. not to move; didn't use to
D. not to move; aren't used to
设f'（0）存在，且f（0）=0，则下列极限不存在的是（）。
A．A
B．B
C．C
D．D
