日本北海道大学进化生物研究小组对三个分别由30只蚂蚁组成的蚂蚁群的活动进行了观察。结

支原体肺炎特点是（）。

A.长期咳嗽，咳大量脓痰，反复出现大咯血

B.45岁以上伴大量长期吸烟史，持续痰中带血

C.咳嗽剧烈时，痰中带血

D.低热、盗汗、咳鲜血痰

E.夜间阵发性呼吸困难伴咳粉红泡沫样痰

血浆蛋白质的pI大多为pH5～6，它们在血液中的主要存在形式是

A．兼性离子

B．非极性分子

C．带正电荷

D．带负电荷

E．疏水分子

正常情况下，油品的变质是由（）引起的。

A.有机酸

B.硫化物

C.过氧化物

D.可溶性胶质

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?