问题 单项选择题

可摘局部义齿的基托直接重衬修理时下面哪一步骤是错误的

A.义齿刷洗干净,并将组织面均匀磨除一层使之粗糙
B.用棉球蘸取石蜡油涂于重衬区的黏膜上
C.戴入口内让患者作功能性整塑,待塑料完全凝固后从口内取出磨光
D.用棉球蘸取单体涂在组织面上使之溶胀
E.调拌自凝塑料,丝状期时涂布于基托组织面上

答案

参考答案:C

解析:让患者做功能性整塑,多余的塑料从基托边缘挤出,形成良好的边缘封闭。在塑料未硬固前,从口内取出义齿,待塑料完全硬固后,去除倒凹区塑料,磨光。在塑料未硬固之前,必须从口内取出义齿,否则塑料进入倒凹区的部分变硬后,义齿便无法从口内取出。从口内取出的义齿,可置入温水中浸泡,使加速完成聚合作用。

阅读理解

Have you ever stayed in a hotel? Most Chinese hotels often provide guests(客人) with things like disposable (一次性的) toothbrushes, toothpaste, shampoo and slippers. Many guests like the idea because they don’t have to bring their own. But, if you travel to Beijing, remember to bring your own things. Starting from June, some hotels in Beijing will no longer provide guests with these disposables. They want to ask people to use less disposable things.

Many disposable things are made of plastic. People throw them away after only using them once. It is a waste of natural resources (资源) and is very bad for the environment. Do you know, one Chinese person makes as much as 400kg of waste a year! Most of that waste comes from disposable things. In Beijing, people throw away about 19,000 tons of plastic bags and 1,320 tons of plastic lunch bowls every year! Plastic can take between 100 and 400 years to break down. So the less plastic we throw out, the better. So, wherever you travel, bring your own things and use them again and again.

Back at home and school, you can also do something to make our world a better place. Try to do these things in your daily life:  Use cloth shopping bags, not plastic ones. After using a plastic bag, wash it out and let it dry. Then you can use it over and over again. Do not use paper cups. At your school dining-room, use your own bowl and chopsticks instead of disposable ones.

To protect our environment and our home, it is very necessary and important for us to save natural resources.

(  ) 11. Why do many hotels provide guests with some disposable things?

A. Let their guests be convenient during their traveling.

B. Hope their guests use less disposable things.

C. Wish their guests to save money.

D. Want their guests to use more disposable things.

(   ) 12. Some Beijing hotels will no longer provide guests with _________.

A. cheap food and drink    B. disposable things 

C. good service           D. free TV programs

(   ) 13. Which of the following is NOT true?

A. Many disposable things are made of plastic.

B. Throwing disposable things away is a waste of natural resources.

C. Plastic is very bad for the environment.

D. Plastic breaks down easily.

(   ) 14. What can we do to make our world a better place at home and school?

A. Use shopping bags made of plastic.       

B. Do not throw away paper cups.

C. Use disposable plates, bowls and chopsticks.

D. Don’t forget to reuse daily necessities(日用品).

(   ) 15. We can tell from the story that ________.

A. people don’t like disposable things at all

B. we can’t use paper or plastic bowls at school

C. we should use less plastic things and protect our environment

D. hotels won’t provide disposable things because they want to save money

填空题