已知命题P:∀x∈R,ex﹣x﹣1>0,则¬P是( )
A:∀x∈R,ex﹣x﹣1<0
B:∃x0∈R,ex0﹣x0﹣1≤0
C:∃x0∈R,ex0﹣x0﹣1<0
D:∀x∈R,ex﹣x﹣1≤0
At the beginning of the 20th century, many people thought that the family was falling apart—__________, they thought it was dying. ( )
下列“化学之最”错误的是( )
在近代城市化进程中,北京与上海的近代化各具特色,也各有困境。整体而言,与上海比较,北京( )