肾小球肾炎中免疫荧光检查时显示阳性的物质是（） A.抗体、补体 B.细菌、补体 C.

阅读理解。

     What do you call someone who speaks three languages? Trilingual. What do you call someone who

speaks two languages? Bilingual. What do you call someone who speaks one language? An American.

     To people in many countries, being bilingual or even trilingual is a way of life. But since the mother

tongue of most Americans is English-a language widely spoken around the world-they often don't feel the

need to learn a foreign language. Moreover, people who live in the heartland of America have little contact

with other linguistic groups, making foreign language skills irrelevant.

     Actually, though, this"land of immigrants" has always had people of many different nationalities and

languages. The 1990 census indicates that almost 14% of Americans speak a non-English at home. Yet

only 3% reported that they spoke English "not well" or "not at all". That means that slightly more than one

out of 10 Americans could be considered bilingual. Besides that, many high school and college students and

even some elementary school students are required to take a foreign language as a part of their curriculum.

In addition to old standbys like Spanish, German and French, more and more students are opting (选择)for

Eastern European and Asian languages. Of course, not all students keep up their foreign language abilities.

As the old saying goes, "If you don't use it, you lose it," But still, a growing number of Americans are coming

to appreciate the benefits of bein  multilingual.

1. What can we learn from this passage?

A. Many Americans don't speak English at home.

B. All Americans speak English very well.

C. Most Americans can only speak one language.

D. In America most students only study one language.

2. Why do most Americans consider foreign languages are not important?

A. Because they think foreign languages are hard to learn.

B. Because English, their mother tongue, is a language widely spoken around the world.

C. Because they don't like foreign languages at all.

D. Because they have poor abilities to learn foreign languages.

3. What does the underlined word "multilingual"mean?

A. Bilingual.

B. Trilingual.

C. Language skill.

D. Speaking many languages.

4. What is happening to Americans now according to this passage?

A. More and more Americans are coming to appreciate the benefits of being multilingual.

B. Most Americans are studying foreign languages.

C. Most students in America are studying foreign languages.

D. Many elementary, high school and college students are required to learn five languages.

①受荒漠化危害，我国每年粮食减产30多亿公斤②建国以来，全国共有66.7万公顷耕地变为沙地③近些年来，我国一些地方乱垦滥挖、毁林毁草开荒，超载放牧，过度樵采等不合理的行为有增无减，使荒漠化程度日益加剧④每年因此少养羊5000多万只⑤也是地球上的所有居民面临的十大全球性生态环境问题之一⑥土地荒漠化不仅仅是我国的问题⑦有235.3万公顷草地变为沙漠，全国退化草地达1.05亿公顷排列组合最连贯的是（）。

A．③①②⑤⑥④⑦

B．⑥⑤⑦②④③①

C．⑥⑤③①②⑦④

D．①②⑥⑤④⑦③

In the idealized version of how science is done, facts about the world are waiting to be observed and collected by objective researchers who use the scientific method to can’y out their work. But in the everyday practice of science, discovery frequently follows an ambiguous and complicated route. We aim to be objective, but we cannot escape the context of our unique life experience. Prior knowledge and interest influence what we experience, what we think our experiences mean, and the subsequent actions we take. Opportunities for misinterpretation, error, and self-deception abound.

Consequently, discovery claims should be thought of as protoscience. Similar to newly staked mining claims, they are lull of potential. But it takes collective scrutiny and acceptance to transform a discovery claim into a mature discovery. This is the credibility process, through which the individual researcher’s me, here, now becomes the community’s anyone, anywhere, anytime. Objective knowledge is the goal, not the starting point.

Once a discovery claim becomes public, the discoverer receives intellectual credit. But, unlike with mining claims, the community takes control of what happens next. Within the complex social structure of the scientific community, researchers make discoveries; editors and reviewers act as gatekeepers by controlling the publication process; other scientists use the new finding to suit their own purposes; and finally, the public (including other scientists) receives the new discovery and possibly accompanying technology. As a discovery claim works it way through the community, the interaction and confrontation between shared and competing beliefs about the science and the technology involved transforms an individual’s discovery claim into the community’s credible discovery.

Two paradoxes exist throughout this credibility process. First, scientific work tends to focus on some aspect of prevailing Knowledge that is viewed as incomplete or incorrect. Little reward accompanies duplication and confirmation of what is already known and believed. The goal is new-search, not re-search. Not surprisingly, newly published discovery claims and credible discoveries that appear to be important and convincing will always be open to challenge and potential modification or refutation by future researchers. Second, novelty itself frequently provokes disbelief. Nobel Laureate and physiologist Albert Azent-Gy6rgyi once described discovery as "seeing what everybody has seen and thinking what nobody has thought." But thinking what nobody else has thought and telling others what they have missed may not change their views. Sometimes years are required for truly novel discovery claims to be accepted and appreciated.

In the end, credibility "happens" to a discovery claim—a process that corresponds to what philosopher Annette Baier has described as the commons of the mind. "We reason together, challenge, revise, and complete each other’s reasoning and each other’s conceptions of reason.

According to the first paragraph, the process of discovery is characterized by its（）

A. uncertainty and complexity

B. misconception and deceptiveness

C. logicality and objectivity

D. systematicness and regularity

面向钻台，节流管汇在井口（）。

A、右边

B、左边

C、前面

D、后面

The development of e-commerce may well bring the world into a brand new era of "electronic currency". At the moment, (52) areas in Europe, the United States and Asia have already started studying the possibility of an electronic currency. Electronic currency is not only about currency. It (53) to an entire finance system on the Net. It includes a virtual numeric currency, an electronic system of withdrawals, transfers and loans, and (54) cards of all shapes and sizes. The (55) of an electronic currency system implies the emergence of "virtual banks" and "virtual enterprises". Actually, the first virtual bank appeared in the US in 1995. (56) it is a small and insignificant bank, it represents the trend of the future. In time to come, we may even have to (57) the familiar paper currency.

As the Net pushes the economy (58) rapidly, the economy is also bringing the Net market forward, resulting in the Internet itself becoming the world’s largest emerging market. Of course, this is just the beginning. Although there are many companies which made huge profits (59) in the Internet market, they tend to be small companies. To date, most companies are making losses. The competition in the knowledge-based economy will also be more (60) This will definitely promote (61) and more efficient cooperation.

57().

A.promote 

B.abandon 

C.encourage 

D.celebrate