问题 单项选择题

若设计为支架式可摘局部义齿,初戴时腭杆与黏膜的最合适关系是

A.轻轻接触

B.紧密接触

C.离开0.5mm

D.离开1.5mm

E.不能无压力

答案

参考答案:A

解析: 支架式可摘局部义齿中的腭杆一般情况下要求与黏膜轻轻接触,如有间隙,唾液在杆与黏膜之间流动,容易刺激黏膜,使患者恶心,另外食物也容易滞积,故选A。而答案B和E均会造成黏膜压力,不能选择。

阅读理解

When people communicate, they need words to express themselves. 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 of 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.

Vocabulary means a lot of words. The words you know are called your vocabulary. You should try to make your own 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.

小题1:The number of different languages spoken is about _______.

A.150

B.15,000

C.500

D.1,500小题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小题3: To make your vocabulary 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小题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小题5: What is your most useful book?

A.Books written in easy English.

B.Books written in English.

C.Your dictionary.

D.Short stories.

单项选择题