Night________(fall),wehurriedhome.

已知函数f(x)满足方程f(x)f(x)2f(x)0及()()2xfxfxe,(I)求f(x)的表达式 (II)求曲线220()()dxyfxftt的拐点.

WeweretoldthatSuewouldbeidealforthejob,butshe________badlywhenwetalkedtoher.

设，则数列sn有界是数列an收敛的（）

Iwon't________thosechildrenmakinganoiseinmyhouse!