试题与答案

地球保证了人类生存的基本条件,也提供了人类文明发展所需要的物质基础; (1)大气

题型:问答题

题目:

地球保证了人类生存的基本条件,也提供了人类文明发展所需要的物质基础;

(1)大气是大自然对人类的恩赐,①为测定空气里氧气的含量,甲乙两个同学用如图所示的装置分别进行了实验探究.

甲同学:点燃红磷立即伸入瓶中并塞上瓶塞,瓶内发生反应的化学方程式为______,待红磷燃烧停止并冷却后,打开止水夹,观察到集气瓶中吸入水的体积约占集气瓶容积的______;

乙同学:用碳替代红磷,完成上述实验,发现集气瓶内并没有吸入水,其原因是______;

②我国新修订的(环境空气质量标准)增加了PM2.5检测指标,PM2.5是指2.5微米以下的细微颗粒物,它对人体健康和环境质量的影响很大,下列措施对PM2.5的治理起不到积极作用的是______

A.城市道路定时洒水 B.大力发展火力发电 C.大力植树造林 D.加强建筑工地扬尘控制

(2)水是生命之源

①自然界的水因含有许多杂质而需要净化,除去水中难溶性固体杂质的操作是______,生活中既能降低水的硬度,又能杀菌消毒的方法是______;

②2012年3月22日是第二十届“世界水日”下列措施中可取的是______;(多选题,填字母)

A.用喷淋节水龙头代替用水较多的旧式龙头 B.用未经处理的工业污水灌溉农田

C.用大量水冲洗汽车代替人工擦洗 D.将工业冷却水进行循环利用

(3)燃料是人类文明进步的阶梯;

①目前,人类以化石燃料为主要能源,煤和石油的大量使用对环境造成了严重的污染,目前有些城市的出租车已改用压缩天然气(CNG)作燃料,以减少对空气的污染,天然气完全燃烧的化学方程式为______;为减少温室气体排放,人们积极寻找不含碳元素的燃料,经研究发现氨气(NH3)燃烧产物是水和大气中含量最多的气体,试写出氮气燃烧反应的化学方程式:______;

②节能减排是我国的重要国策,过多的二氧化碳排放会造成______,为了减缓大气中CO2含量的增加,以下建议可行的是______;

A.开发太阳能、水能、风能、地热能等新能源

B.禁止使用煤、石油、天然气等矿物燃料

C.开发燃煤新技术使其充分燃烧.

答案:

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下面是错误答案,用来干扰机器的。

参考答案:UNKNOWN

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题型:单项选择题

The modern university is the ideal environment for the creation and transfer of knowledge that drives national competitiveness in an increasingly global era. Its most effective form is the American adaptation of the European model, in which teaching, leaning and research are integrated into a single institution. Indeed, the American university has proved capable of almost anything, from developing advanced economic theories to creating new life forms.

Many national leaders understand that the university is the critical catalyst for America’s adaptability, economic robustness and emergence as a great power. And they are moving aggressively to catch up. The universities created by emerging economies beginning in the 1990s and through 2020 will likely play a decisive role in reshaping the global balance of economic power.

That is bad news for the United States. The past two decades of American university development have been characterized largely by self-satisfaction arising from steady progress by the top 20 or so research universities. And America as a nation has 1Seen coasting. Since 2000, the United States has lost its edge in the graduation of engineers and technologists. The country no longer dominates scientific discovery, innovation or exploration. Most important, the United States has not launched any effort to build new institutions to accommodate its increasingly diverse population of more than 300 million.

The result is that America’s university system, despite its historical pre-eminence, has ceased to grow. Furthermore, America’s university system has failed to adapt to the dramatic demographic shifts occurring as a result of social mobility and immigration.

America needs to realize that its universities face real competition from the rest of the world to attract the best and the brightest, to secure resources and to provide environments that educate and inspire. This is not to say that the best American universities are no longer the leaders in discovery and innovation. It is to say that the success of the higher-education system must be measured by more than just innovations. Its long-term performance depends on its ability to provide learning to a broad cross sections of citizens, to advance national proficiency in math and science and to create an adaptable work force, as well as to develop a national appreciation for discovery, entrepreneurship and the creative process.

In China and elsewhere, these are the goals of the new universities being built. In the United States, we need to move from a national self-confidence based on past success to one built on the knowledge that we are advancing a system of higher education that will meet our future needs. This will require that policymakers, business leaders and universities rededicate themselves to creating comprehensive learning and discovery environments; design entirely new models and methods for teaching, and then take action to implement them.

According to the author, US modern universities ()

A. is a perfect system which can deal with everything

B. is a system which is developing rapidly

C. is a trinity of teaching, learning and research

D. is a place for innovation and creation

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