已知函数f（x）=$\left\{\begin{array}{c}{x}^2+5x+4,x\le 0\\ 2\left|x-2\right|,x>0\end{array}\right.$，若函数y=f（x）﹣a|x|恰有4个零点，则实数a的取值范围为____ 

为打击德国共产党和进步人士，纳粹党制造了（   ）

Mike: Let's have a big meal.

Lily&Emma: Wow, we like the pizza.

John: I like pizza, too.

Mike: Do you like hot dogs, Sam?

Sam: Yes, I do. What about you, Mike?                                             

Mike: Me too.

选择正确的答案填在括号里。

在下列关于生态系统的叙述中不正确的是                         （ ）