已知函数,则下列说法中正确的是（  ）

A：若，则恒成立

B：若恒成立，则

C：若，则关于的方程有解

D：若关于

    These feelings of insecurity(不安全)and self­doubt are both unavoidable and necessary if we are to change and grow.If we protect ourselves too much，then we stop growing.We become trapped inside a shell of our own making.

①____, ②____,③____,④____,⑤____,

⑥____,⑦____,⑧____,⑨____,⑩____,