All the Chinese people are living a life.
A:peacefully
B:peaceful
C:nervous
设函数f(x)在R上存在导数f′(x),∀x∈R,有f(﹣x)+f(x)=x2,在(0,+∞)上f′(x)<x,若f(4﹣m)﹣f(m)≥8﹣4m.则实数m的取值范围为( )
It took the man less time to fly to Xi'an than it _______ there.
下列有关人体生命活动的调节的叙述错误的是( )