My uncle has a farm. It's big. On the farm, you can see two ____ . There are twenty ____ and eighteen ____ on the farm. You can see eleven ____ , thirteen____ and fifteen____ .

定义域为R的函数$f\left(x\right)=\left\{\begin{array}{c}\frac{1}{\left|x-2\right|},\left(x\ne 2\right)\\ 1,\left(x=2\right)\end{array}\right.$，若关于x的方程f²(x)+bf(x)+c=0恰有5个不同的实数解x₁,x₂,x₃,x₄,x₅，则x₁+x₂₊x₃+x₄+x₅=（    ）

如图所示，广口瓶内盛有少量澄清石灰水，内放一株绿色植物，瓶塞塞住，并用凡士林密封．