设函数f（x）=x，则函数在点x=0处（）.
A.连续且可导
B.连续且可微
C.连续不可导
D.不连续不可微
参考答案：C
More and more people have realized we won't have cleaner water to drink unless something ______ soon.[ ]
A. was done
B. will be done
C. to be done
D. is done
受项目法人的委托，监理单位按照( )规定在现场独立负责项目的建设工期、质量、投资的控制和现场施工的组织协调工作。
A．法律 B．强制性条文C．合同 D．监理规划
