关于鼻窦开口的叙述正确的是（） A.额窦和上颌窦开口于中鼻道 B.额窦开口于下鼻道

A rabbit is running into his hole. You may ask, “What happened?”

Well, when a rabbit sees something dangerous, it runs away. Its tail moves up and down as it runs. When other rabbits see this tail moving up and down, they ran, too. They know there is danger. The rabbit has told them something without making a sound. It has given them a signal.

Many other animals use this kind of language. When a bee finds some food, it goes back to his home. It can’t tell the other bees where the food is by speaking to them, but it does dance in the air. This tells the bees where the food is.

But animals say things by making sounds. A dog barks, for examples, when a stranger comes near. A cat purrs(发出呼噜呼噜的声音) when pleased. Some birds make several different sounds, each with its own meaning.

But human beings have something that no animals have---- a large number of words about things, actions, feelings or ideas. We are able to give each other information to tell or inform other people what is in our mind or how we feel. By writing words down we can remind ourselves of the things that have happened, or send messages to people far away. No animals can do this. No animals has the wonderful power of language.

No one knows how man learned to make words. Somehow he learned to make them. As centuries went by, he made more and more new words. This is what we mean by language.

People in different countries made different kinds of words. Today there are about fifteen hundred different languages in the world. A very large English dictionary, for examples, contains four or five hundred thousand words. But we don’t know all these. The words we know are called vocabulary. We should try to make our vocabulary larger. Read as many books as possible. When we met a new word, look it up in the dictionary. A dictionary is the most useful book.

小题1:What’s the meaning of the underlined word?

A．标语

B．信号

C．唱片

D．图像小题2:A dog can tell something__________.

A．by giving signals

B．by making different sounds

C．by purring

D．by barking小题3:It has been proved that no animals are able to_________.

A．give the others information

B．express their actions and feelings with words

C．tell others how they feel

D．make different sounds, each with its own meaning.小题4:Generally speaking, what we mean by “vocabulary” is_______.

A．all the words that we know

B．more and more words we use

C．all the words we need

D．the dictionary which contains thousands of words小题5:What must we do in order to make our vocabulary larger?

A．Make more and more new words

B．look up some new words in a dictionary

C．learn more language

D．Try to read as many books as possible

实行有差别的销售利润率的作用主要有（）。

A.有利于促进企业收回前期的研制开发费用

B.有利于得到合理的投资回报

C.有利于增强其继续研制开发新药的积极性

D.有利于提高人民生活水平

E.有利于实现共同富裕

（6分）在常温下，Fe与水并不起反应，但在高温下，Fe与水蒸气可发生反应。 应用下列装置，在硬质玻璃管中放入还原铁粉和石棉绒的混合物，加热，并通入水蒸气，就可以完成高温下“Fe与水蒸气的反应实验”。请回答该实验中的问题。

（1）写出该反应的反应方程式                                         。

（2）圆底烧瓶中盛装的是水，该装置受热后的主要作用是                            ；烧瓶底部放置了几片碎瓷片，其作用是                  　　      。

（3）试管中收集气体是       ，如果要在A处玻璃管处点燃该气体，则必须对该气体进行             。

江苏东台市新农镇临海村青年农民崔益祥从邻乡农民邓瑞云土法上楼板导致楼房倒塌一死三伤的重大事故中得到启示：中国有2．2亿个家庭在农村，如果有厂家专为农村建筑开发一个起吊安装楼板的自动化设备，将有一个了不起的市场空间。有了这样的想法，崔益祥筹资10万元开发费，在南京建工学院专家教授指导下顺利开发成功全自动楼板吊装机，这种由手扶拖拉机、发电机、卷扬机、自动伸缩塔、空中平面输送轨道、电控箱等组合而成的成套设备，只需一个手握控制器远距离操作即可将楼板从平地举吊到一4层楼面。这种小型吊装设备一生产出来，在农村市场很受欢迎，而且带动了一项新的产业。有一位原从事出租模板业务的人，买了一台这种设备，在农村从事楼板吊装业务，头一年就收入l0万元。

2．对自己有哪些启发？学到了哪些东西？

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