问题 单项选择题 A2型题

男,17岁,因急性根尖周炎进行根管治疗,在根管预备后,选择5%次氯酸钠、3%H202交替冲洗根管,选择该组冲洗液的原因如下,但不包括()。

A.能溶解根管壁牙本质

B.有充分发泡作用能使根管内碎屑朝着牙冠方向排出

C.能产生新生氧

D.有很强的杀菌作用

E.对坏死组织有溶解作用

答案

参考答案:A

单项选择题
阅读理解

阅读理解。

     Facial expressions carry meaning that is determined by situations and relationships. For example, in

American culture (文化) the smile is in general an expression of pleasure. Yet it also has other uses. A

woman's smile at a police officer does not carry the same meaning as the smile she gives to a young child. A smile may show love or politeness. It can also hide true feelings. It often causes confusion (困惑)

across cultures. For example, many people in Russia smiling at strangers in public to be unusual and even

improper. Yet many Americans smile freely at strangers in public places (although this is less common in

big cities). Some Russians believe that Americans smile in the wrong places; some Americans believe that Russians don't smile enough. In Southeast Asian culture, a smile is frequently used to cover painful feelings. Vietnamese people may tell a sad story but end the story with a smile.

     Our faces show emotions (情感), but we should not attempt to "read" people from another culture as we would "read" someone from our own culture. The fact that members of one culture do not express

their emotions as openly as do members of another does not mean that they do not experience emotions.

Rather, there are cultural differences in the amount of facial expressions permitted. For example, in public

and in formal situations many Japanese do not show their emotions as freely as Americans do. When with

friends, Japanese and Americans seem to show their emotions similarly.

     It is difficult to generalize about Americans and facial expressiveness because of personal and cultural

differences in the United States. People from certain cultural backgrounds in the United States seem to be more facially expressive than others. The key is to try not to judge people whose ways of showing

emotion are different. If we judge according to our own cultural habits, we may make the mistake of

"reading" the other person incorrectly.

1. What does the smile usually mean in the U.S.?

A. Love.

B. Politeness.

C. Joy.

D. Thankfulness.

2. The author mentions the smile of the Vietnamese to prove that smile can ___ .

A. show friendliness to strangers

B. be used to hide true feelings

C. be used in the wrong places

D. show personal habits

3. What should we do before attempting to "read" people?

A. Learn about their relations with others.

B. Understand their cultural backgrounds.

C. Find out about their past experience.

D. Figure out what they will do next.

4. What would be the best title for the test?

A. Cultural Differences

B. Smiles and Relationship

C. Facial Expressiveness

D. Habits and Emotions