—I won't get good grades_______ I study hard.
—That's ______ everyone is trying his best to prepare for the exam.
已知定义在R上的可导函数y=f(x)的导函数为f'x,满足f'x<fx,且y=fx+1为偶函数,f(2)=1,则不等式fx<ex的解集为 ( )