雌激素在 A．肝内灭活 B．肾内灭活 C．肺内灭活 D．靶器官内灭活 E．血浆内灭活

早期城市形成的主要动因是()。

A．第二次人类劳动大分工

B．第一次人类劳动大分工

C．商业和手工业从农牧业中的分离

D．商业和手工业的兴起

Who are these people rushing by you in the street? More than 215 million people now call America “home”, but most of them can trace their families back to other parts of the world. If you look at the names on shop windows, you will see that Americans come from many different lands. The idea that these people, who once were strangers to the United States, have lost the customs and cultures of their original countries and have become “American” is really not true. In fact, what exists in America is more often a kind of “side-by-side” living in which groups of people from other countries often have kept many of their customs and habits. They join the general American society only in certain areas of their lives—such as in schools, business, and sports—but they keep many of their own native customs and manners socially and at home. This living “side-by-side” has both advantages and disadvantages. Sometimes it may cause disagreements to develop between groups whose ways of life are very different from one another. However, there are also great advantages that come from the variety of cultures brought by settlers from other lands. There is great freedom of choice among ideas and dress, food, and social customs in America. Everyone can find some part of his or her familiar world in the United States, in churches, music, food, national groups, or newspapers.

6. More than 215 million people call America “home” because_______.

A. they buy their houses there              B. they settle there now

C. they get married there                  D. they were born there

7. “Side-by-side” living style means _______.

A. making friends with native people

B. keeping their own customs while sharing American ones in certain areas

C. the groups of people who live nearby

D. that they get closer to American society

8. According to the passage, people in the USA ________.

A. share American customs and culture

B. live in a kind of “side-by-side” society

C. keep their own customs and habits firmly

D. make no choice to accept American customs

9. Which of the following statements is true?

A. They always stick to their own customs and habits.

B. “Side-by-side” living style is not suitable.

C. They face the society they are not familiar with.

D. The advantages coming from the variety of cultures make life in America colorful.

10. Which title of the following can best take the place of “Different Cultures in America”?

A. Advantages and Disadvantages.       B. Different Customs and Habits.

C. Home for the People.               D. “Side-by-side” Living Style in America.

（10分）把0.1molMnO₂粉末加入50ml过氧化氢的溶液里（密度为1.1g·mL^－1），在标准状况下，放出气体的体积V和时间t的关系曲线如图所示。

（1）实验时放出气体的体积为                 。

（2）放出一半气体所需的时间约为                   。

（3）A、B、C、D各点反应速率由快到慢的顺序是              。

（4）根据曲线形状解释反应速率变化的原因                       。

（5）计算反应前过氧化氢的物质的量浓度             

合格的管理人员应具备（）。

A.技术技能

B.人际技能

C.概念技能

D.沟通协调技能

主板加电后如果没有任何反应，不报警，显示器也不亮，要最后检查（）部件。

A.CPU

B.电源

C.主板

D.硬盘