问题 填空题

为了保证潜水艇长时间的潜航,需要在潜水艇里配备氧气再生装置.现有以下几种制氧气的方法:a加热高锰酸钾 制氧气  b电解水制氧气  c在常温下用过氧化钠(Na2O2)固体与二氧化碳反应生成碳酸钠和氧气.

(1)你认为最适合在潜水艇里制氧气的方法是______,与其它两种方法相比,这种方法的优点是(答出两点)①______;②______.

(2)写出过氧化钠与二氧化碳反应的化学方程式______.

答案

(1)方法c不用加热,不用通电,操作简单,还能将人呼出的二氧化碳转化为氧气.

故答案为:c;不需加热或通电;能将呼出的二氧化碳转化为氧气;

(2)已知过氧化钠与二氧化碳在常温下反应生成碳酸钠和氧气.

故答案为:2Na2O2+2CO2=2Na2CO3+O2

阅读理解

For the most part, schools are designed to produce people who fit into society, not people who set out to change it. However, schools, particularly universities, may not only spread culture; they may add to the cultural heritage(遗产). Today American society places a good deal of emphasis on the development of new knowledge, especially in the physical and biological sciences , medicine, and engineering. In the recent years, the nation’s leading universities have increasingly become research centers.

An emphasis(强调)on research has led universities to judge professors not by abilities as teachers, but as researcher. promotions(提升), salary increases , and other benefits have long been dependent on research and publication. However, the most important is no longer publishing. To be successful these days, professors have to bring in money provided by government and private industry. Critics claim that academic(学术) success is most likely to come to those who have learned to“ignore”their teaching duties to pursue research activities. Defenders say that even when students themselves are not involved in research projects they benefit from such an emphasis on research.

Major research universities like the Massachustts Institute of Technology have also cooperated with industrial companies to develop technology and products with commercial potential(潜能).With university-industry ties continuing to grow, debate(辩论)has increased about the consequences for basic science, academic openness, the control of information, the direction of research, and the influence on students.

1. According to the passage, which of the following is NOT emphasized by today’s American society?

A. Physical science.          B. Biological science.

C. Engineering.            D. Computer science.

2. In the present standard, a successful professor is one who can____.

A. teach well             

B. get financial support for research

C. get the highest salary    

D. have many publications

3. Supporters of the present emphasis on research argue that_____.

A. it involves more students in it.

B. it does good to students anyway.

C. it has a direct good effect on teaching

D. it earns a lot of money for a university

4. The author seems to be_____ the move of emphasis to research.

A. totally against   B. sorry to see      C. in favor of    D. neutral (中立) about

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