阅读理解

Happy Family Salad

Ingredients :

Two adults ( married, responsible and loving parents)

One child (or more)

Two large bowls of tolerance (宽容)

A cup of understanding

Four leaves of fun and games

Two tablespoons of salad cream of kindness

A whole heap of sharing and caring

A bag of happy thoughts

A bag of smiles

Method :

1). Put all the ingredients except the leaves of fun and games, cream of kindness, happy,thoughts and smiles, in a mixing bowl.

2). Pour in the cream of kindness and mix well.

3). Arrange the leaves of fun and games in a salad bowl.

4). Sprinkle (撒) the happy thoughts and smiles on top and serve.

Serving suggestion :

Do not refrigerate. Always serve salad fresh and eat immediately, and together as a family.

Stale salad should be discarded before it breeds unhappiness.The Happy Family Salad can be

eaten at a as art of breakfast, lunch or dinner.

根据材料内容选择最佳答案，并将其标号填涂在答题卡相应位置。

 铬(Cr)为不锈钢主要的添加元素，含量一般在12％以上。铬的表面生成一薄层致密的钝态氧化物保护膜是不锈钢具有耐蚀性主要原因。请回答下列问题：
(1) 铁生锈的主要条件是铁与____ 和____ 直接接触。
(2) 不锈钢是一种____ （填“合金”或“金属”）。
(3) 相同温度下，取大小相同、表面光亮的Cr、Mg、Cu三种金属薄片，分别投入等体积等溶质质量分数的足量稀盐酸中（反应中Cr显+2价），现象如下：

① 上述三种金属的活动性由强到弱的顺序是____ 。
② 从上述探究实验可知，Cr____ （填“能”或“不能”）跟硫酸铜溶液反应。若反应，请写出反应的化学方程式____ 。