在原子吸收光谱法中说法正确的是（）。 A.富燃火焰适合于测定易形成难解离氧化物的元素

Throughout history, people have been interested in knowing how language first began, but no one knows exactly where or how this happened. However, we do know a lot about languages, the language of today and also the languages of earlier times. There are probably about three thousand languages in the world today. Chinese is the language with the most speakers. English, Russian and Spanish are also spoken by millions of people. On the other hand, some languages in the world have less than one hundred speakers.

There are several important families of languages in the world. For example, most of the languages of Europe are in one large family called Indo-European. The original language of this family was spoken about 4,500 years ago. Many of the present-day languages of Europe and India are modern forms of the language of 4,500 years ago.

Languages are always changing. The English of today is very different from the English of 500 years ago. In time, some even die out completely. About 1,000 years ago, English was a little known relative of German spoken on one of the borders of Europe.

If a language has a number of speakers, or if it is very old, there may be differences in the way it is spoken in different areas. That is, the language may have several dialects. Chinese is a good example of dialect differences. Chinese has been spoken for thousands of years by many millions of people. The differences between the dialects of Chinese are so great that speakers of Chinese from some parts of China can’t understand speakers from other parts.

小题1:The first paragraph mainly tells us that_______.

A．most people in the world speak Chinese

B．there are thousands of languages in today’s world

C．man has much knowledge about languages

D．some people know several languages小题2:Most European and Indian languages_______.

A．will soon die out completely

B．were once a relative of English

C．are no longer spoken

D．come from the same family of language.小题3:Which of the following statements is true according to the passage?

A．Chinese is the language with the most speakers.

B．English was a well-known relative of German spoken on one of the borders of Europe.

C．A language has many speakers, but there may be no differences in the way it is spoken in different areas.

D．Speakers of Chinese from some parts of China can understand speakers from other parts.小题4:It is considered a most difficult thing for one to learn to speak Chinese because_______.

A．there are great differences between the dialects of Chinese

B．Chinese and many foreign languages are not of the same family

C．Chinese is a very old language

D．there are great differences between the old Chinese and the present-day Chinese小题5:The underlined word “dialect” in the last paragraph means_______.

A．a special language spoken by Chinese

B．the sign used by Chinese people in a special area

C．the difference between the old and today’s Chinese

D．the form of a language used in one part of the country

考古工作者对刚出土的铁制文物进行锈蚀鉴别时，将器件放在蒸馏水中加热浸泡，然后取出浸泡液少量，滴入硝酸银溶液，出现白色沉淀，再加几滴稀硝酸也不溶解，则说明该器件锈蚀层一定是含有______元素的化合物．已知+3价铁盐比+2价铁盐稳定，试写出检测时发生反应的化学方程式______．

阅读下面的文言文，完成第16～18题。
(李)广行无部伍、行陈，就善水草舍止，人人自便，不击刁斗以自卫，莫府省约文书；然亦远斥候，未尝遇害。程不识正部曲、行伍、营陈，击刁斗，士吏治军簿至明，军不；得休息；然亦未尝遇害。不识曰：“李广军极简易，然虏卒犯之，无以禁也；而其士卒亦佚乐，咸乐为之死。我军虽烦扰，然虏亦不得犯我。”……然匈奴畏李广之略，士卒亦多乐从李广而苦程不识。
臣光曰：《易》曰：“师出以律，否臧凶。”言治众而不用法，无不凶也。李广之将，使人人自便。以广之材，如此焉可也；然不可以为法。何则其继者难也，况与之并时而为将乎!夫小人之情，乐于安肆而昧于近祸，彼既以程不积为烦扰而乐于从广：且将仇其上而不服。然则简易之害，非徒广军无以禁虏之仓卒而已也!故曰“兵事以严终”，为将者，亦严而已矣。然则效程不识，虽无功，犹不败；效李广，鲜不覆亡哉! (《资治通鉴》第十七卷)

不同规模企业的组织结构，在下列各主要特征方面有着明显的判别是（）

A.大型企业比小型企业具有更多的生产部门和管理部门

B.当企业规模扩大时，分权将增加

C.大型企业的正规化程度比小型企业高

D.大型企业的专业人员比率比小型企业高

E.大型企业的中高层行政领导人员占全体职工的比重要比小型企业高