在海上运输货物保险特别附加险中的进口关税险中，保险人对进口关税的赔偿是被保险人就()

While he was investigating ways to improve the telescope, Newton made _______ discovery which completely changed _______ man’s understanding of colour.

A．a；/

B．a；the　

C．/；the

D．the；a

我国《海洋倾废管理条例》规定，禁止倾倒的废弃物，在紧急情况下，经（）批准，获得“紧急许可证”后，可到指定的区域按规定的方法倾倒。

A．国家检验检疫局

B．国家环保局

C．国家海洋局

D．国家海事局

计算曲线积分，其中L为上半圆x²+y²=4和y=0所围成的曲线，取逆时针方向．

阅读理解

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

American culture 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 consider 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 cultures, 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 expressiveness 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

backgrounds 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 a 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 Relationships

C. Facial Expressiveness

D. Habits and Emotions

在死锁的防止策略中，______是指进程必须在开始执行前就申请它所要的全部资源，仅当系统能满足进程的资源申请要求且把资源分配给进程后，该进程才开始执行。