2007年3月29日《人民日报》报道：国务院办公厅印发了《少数民族事业“十一五”

阅读理解。

     People living in different countries made different kinds of words. Today there are about fifteen hundred

  languages in the world. Each contains many thousands of words A very large dictionary, for example,

 contains four or five hundred thousand words. But we do not need all these. To read short stories you

 need to know only about two thousand words. Before you leave school, you will learn only one thousand

  or more.

     The words you know are called your vocabulary. You should try to make your vocabulary bigger.

 Read as many books as you can. There are a lot of books written in easy English for you to read. You will

  enjoy them. When you meet a new word, find it in your dictionary. Your dictionary is your most useful

 book.      

1. The number of different languages spoken is about _____.

    A. 150          

    B. 15 000              

    C. 500                

    D. 1500 

2. Before you leave your school, you'll learn _____.

    A. only two thousand words                    

    B. five hundred thousand words

    C. more than one thousand words              

    D. three or four thousand words

3. To make you vacabulary bigger, you must _____.   

    A. get as many dictionaries as you can      

    B. read as many books as you can

    C. buy a lot of books              

    D. have a very large English dictionary

4. You will enjoy_____.       

    A. the books written in easy English            

    B. your dictionary

    C. your new words                        

    D. finding new words in a dictionary

5. From the passage we know that one_____ if he knows abut two thousand words

   A. can read long difficult stories      

    B. can read easy short stories

    C. can read as many books as he likes      

    D. will find the dictionary not useful

口腔中的消化既有物理消化又有化学消化。（   ）

下列关于血栓闭塞性静脉炎的特征描述正确的是

A．没有间歇性跛行
B．游走性血栓性浅静脉炎
C．累及内脏
D．肢体皮肤正常
E．与酒精中毒有关

螺旋反折包扎用于（）

A.膝关节

B.大腿

C.肩关节

D.前臂，小腿

E.上臂

简述20世纪免疫学的主要成就有哪些？