生活中处处有化学．现有C、H、O、Na四种常见的元素，请选用其中的元素写出符合下列要求的物质各一种（用化学式表示 ）：

①汽水中含有的酸____；

②发酵粉的成分之一小苏打____；

③人体直接吸收利用的糖类____； ④司机开车前喝的饮料中不能含____（写名称）．

把耶路撒冷奉为圣城的宗教是（    ）

完形填空,阅读下面的短文，从短文后各题所给的选项中选出能填入空白处的最佳答案。

Bees live in a house that is called a hive. There are three kinds of bees: workers, drones (雄蜂) 1queens. Only one queen bee can live in each hive. If she is lost or dead, the other bees 2 their work.

Workers are very clever and busy. They all join together3 small rooms called cells of wax for their honey. Each worker bee does its own work. Some go out and collect honey from the flowers; 4 stay at home and work inside the hive. The cells5have six sides are made by worker bees. Did you ever look into a glass hive and see them while at work? It is 6to see how busy they always are. Before winter comes, all the drones are driven from the hive7 they don’t eat the honey they did not collect.

It is not safe 8 children to be too close to bees. Bees have painful stings they use in their defense (防御).

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