阅读下面材料，在空白处填入适当的内容(1个单词)或括号内单词的正确形式。

    We  are what we eat because what we eat every day has ____ great impact on our health.Therefore，we should make everyeffort to change our bad eating habits. ____ we all know，baked or fried foods may be ____(taste) , but eating toomuch of them will ____(probable) result in some illnesses. Moreover, some foodthat costs us a great deal of money and is not healthy is junk food.

____(compare)withpeople in the West, Chinese people used to eat more grain and vegetables, but____(little)meat, which is a good eating habit. However, things are quitedifferent now. With the rapid economic ____(grow)of our country, we now areeating a lot of food that is high in sugar and fat. We ____(run) the risk ofeating out without considering the balance of our diet.

      The food we choose affects our health, so wemust keep ____mind that the food we choose should give ____(we) the nutrientswe need.

请回答下列问题：

设变量$x,y$满足约束条件$\{\begin{array}{c}x-y\ge -1\\ x+y\ge 1\\ 3x-y\le 3\end{array}$,则目标函数$z=4x+y$的最大值为（　　 ）

（Ⅰ） EF∥平面A₁BC₁；

（Ⅱ） 平面AEF⊥平面BCC₁B₁．