国有资本、集体资本、非公有资本等交叉持股、相互融合的混合所有制经济的优势是()A、有

中华人民共和国是在______年______月______日成立的，到______年______月______日正好成立80周年．

在数铣中，软磁盘属于（）的一种。

A、控制介质

B、控制装置

C、伺服系统

D、机床

阅读理解。

     Recently more students are choosing to study abroad as they think it is worthwhile. However, some

people think it is not a good idea. There are a number of disadvantages in studying abroad. The following

paragraphs will explain why students have these views and the advantages of studying abroad will be

discussed.

     Students studying abroad may suffer from racial discrimination (歧视). As they left their home

country, they will become part of a minority group in the new country. The majority group may have a

sense of superiority and try to bully them. It is common that Americans or the British discriminate against

people from other countries since many of them think that white people are better than others.

      In addition, the students may lose their own cultures. Since they have moved to a new place, all the

thing there - people, lifestyle and the living environment---would be different from those in their own

country. As they will have close contact with the local people and culture, they will be influenced by the

new culture even without realizing it. It is ironic that a Chinese person speaks better English than Chinese

and forgets about Chinese culture after studying abroad for a few years.

       On the other hand, studying abroad will widen the view of students. Although they may give up their

own culture, they can really learn from others. As students of the modern world , they should not limit

their scope to their home country, but get exposed to the world. Studying abroad can help them expand

their horizon and learn many things in the host country, as they will meet and make friends with people

from all over the world. So, studying abroad is good for them.

      Furthermore, students will learn how to be mature and independent. Students, when in their home

country, usually rely on their parents. Statistics show that Chinese students usually rely heavily on their

parents; they will leave problems alone and ask their parents to solve them. If they are studying abroad,

on many occasions they have to learn how to cope with difficulties they meet. As a result, studying

abroad benefits them.

   Moreover, the education system of the foreign country may be better than the home country's

education system. The home country's education system is very limited. Many teachers just spoon-feed

their students. They will ask the students to recite a lot of things and then ask them to write them down.

This choice of subjects in school, especially in secondary school, is very narrow; the students cannot

choose what they want most. But in some schools in Britain and America, students can choose from a

wider range of subjects at school. For example, media studies and corporate communications are

courses of study in some schools of those two countries. If students choose to study abroad, they may

have the opportunity to learn more things under a better education system.

     All in all, studying abroad will change and influence a student in many aspects. Although it is uncertain

if the effects will be positive or negative, I believe students should seize the opportunity to study abroad

because they will meet many new things and have new experiences in the new country. If they are clever

enough, I think they can find a balance between learning about the new culture and holding onto their

own one.

1. Students studying abroad _____.

A. will be respected by the locals.

B. will forget their ancestors.

C. may be treated unfair.

D. may have difficulty overcoming homesickness.

2. What can we learn from Paragraph 3?

A. The language environment will shorten the time of learning a language.

B. Students studying abroad may be influenced by the new culture unknowingly.

C. Studying abroad is much more comfortable than studying in your own country.

D. A Chinese studying abroad only needs a few years to speak excellent English.

3. Why can studying abroad widen the view of students?

A. Because they may give up their own culture.

B. Because they have to solve everything on their own.

C. Because they can recite a lot of things and write them down.

D. Because they can meet and make friends with people from around the world.

4. From the last paragraph, we can know that the writer _______. 

A. agrees that students should take the opportunity to study abroad.

B. thinks that the effects of studying abroad will be positive and helpful.

C. has been to a foreign country to see new things and have new experience.

D. has found a balance between learning about a new culture and holding onto his own.

5. Which of the following can best serve as a title for this passage? 

A. Should students study abroad and work there?

B. Should students leave their own country and study abroad?

C. Should students studying abroad give up their own culture?

D. Should students learn how to be mature and independent?

如图是氧化沉淀法生产复印用Fe₃O₄粉的工艺流程简图，根据要求回答问题．

（1）铁的另两种常见氧化物的化学式是______．

（2）副产品P是______，由溶液N获得该副产品的操作顺序是b→______→______→d．

a．过滤；b．加热浓缩；c．冷却结晶；d．晶体加热至完全失去结晶水

（3）通空气时的化学方程式是4Fe（OH）₂+2H₂O+O₂

△   .

4Fe（OH）₃，由沉淀M获得Fe₃O₄的过程中发生的反应为Fe（OH）₂+2Fe（OH）₃═Fe₃O₄+4H₂O，控制“一定量空气”的目的是______，沉淀M中Fe（OH）₂ 和Fe（OH）₃的最佳质量比为______．

就给定资料所反映的主要问题，用1 200字左右的篇幅，自拟标题进行论述。要求中心明确，内容充实，论述深刻，有说服力。