在宏观，微观和符号之间建立联系是化学学习的特点。

（1）用化学用语填空：

①一个镁离子　   　；        ②-2价的氧元素　    　；

③两个铁原子　   　；        ④空气中最多的物质的构成微粒　    　。

（2）尿素[CO(NH₂)₂]是一种常用的化肥，工业上生产尿素的反应的微观示意图如下：

②生产尿素的反应中，A与 B的质量比为　      　。

阅读下面的短文, 然后按照要求写一篇150词左右的英语短文。

Reading is an important activity for many Americans. Today, thousands of men, women and children belong to groups to discuss the books they read.

No one is sure how many Americans belong to reading groups called book clubs. Yet publishers and bookstores report that more and more people throughout the United States are joining them. Most of the clubs work the same way. Members read the same book at the same time. Then they meet to talk about the book. Members may be friends or people who live near each other. Or, they may be people who work together. Some book clubs develop from other organizations. Religious and community groups often establish book clubs.

Some Americans belong to reading groups on the Internet service. These groups include people around the world who communicate about books they read. These people send emails instead of meeting to discuss books. Book clubs may be for only women or only men. Or, they can be for husbands and wives together. Some are family groups where parents attend with their children. Children also may belong to book clubs of their own.

[写作内容]

1.   以约30个词概括短文的要点；

2.   然后以约120个词就“阅读”的主题发表看法，至少包括如下要点：

1.你对读书俱乐部的看法；

2.介绍一本你最喜欢的书及对其的体会；

3.你认为阅读的意义是什么。

[写作要求]

1)   可以使用实例或其它论述方法支持你的论点，也可以参照阅读材料的内容，但不得直接引用原文中的句子;     

2)   标题自定

[评分标准]    概括准确，语言规范，内容合适，篇章连贯。