问题 填空题

通过化学学习我们认识了许多的物质,请回答以下问题:

(1)氮气约占空气体积的        ;供给呼吸的气体是        

(2)煤、石油和     是重要的化石燃料,大量使用化石燃料会使二氧化碳过多的排放,导致全球变暖.科学家采用高新技术,将二氧化碳和氢气在一定条件下组合,生成一种重要的化工原料乙烯(C2H4)和水,该反应的化学方程式为        

(3)下列日常生活中的做法,符合“低碳生活”理念的是       (填字母,下同).

A.节约使用纸张     B.分类回收处理垃圾

C.减少使用塑料袋    D.减少使用一次性纸杯

(4)上海世博会在环保节能方面有一些新技术、新能源和新材料.下列表述不属于上述情况的是     

A.太阳能的利用                      B.地源热泵节能技术的使用

C.世博会开幕倒计时                  D.园区内交通工具实现零排放

E、优化建筑设计,增强室内自然采光,减少照明用电.

答案

(1)78%;O2

(2)天然气;2CO2+6H2C2H4+4H2O;

(3)ABCD;

(4)C

题目分析:

(1)空气的成分及各成分的体积分数分别是:“氮气78%、氧气21%、稀有气体0.94%、二氧化碳0.03%、其他气体和杂质0.03%”.氮气的体积是78%,能供给呼吸的气体是氧气;

(2)煤、石油和天然气是重要的化石燃料,大量使用化石燃料会使二氧化碳过多的排放,导致全球变暖,科学家采用高新技术,将二氧化碳和氢气在一定条件下组合,生成一种重要的化工原料乙烯(C2H4)和水,其化学方程式为:

2CO2+6H2C2H4+4H2O;

(3)“低碳生活”是指降低二氧化碳的排放量,减少环境污染,节约使用纸张,分类回收处理垃圾,减少使用塑料袋,减少使用一次性纸杯,都符合)“低碳生活”的理念,故选ABCD.

(4)环保节能方面用一些新技术、新能源和新材料,新能源则是不同于化石燃料的能源,太阳能、核能、风能、地热能、风能、水能、潮汐能均属新型能源,使用新技术、新能源和新材料,能减少排放,既节约又环保,世博会开幕倒计时不符合题意,故选C

单项选择题
阅读理解

阅读理解

     Going to school means learning new skills and facts in such subjects as reading, math, science, history, art or music. Teachers teach and students learn, and many scientists are interested in finding ways to

improve both the teaching and learning processes.

     Some researchers, such as Sian Beilock and Susan Levine, are trying to learn about learning. Beilock

and Levine are psychologists at the University of Chicago. Psychologists study the ways people think and behave, and these researchers want to know how a person's thoughts and behavior are related.

     In a new study about the way kids learn math in elementary school, Beilock and Levine found a

surprising relationship between what female teachers think and what female students learn: If a female

teacher is uncomfortable with her own math skills, then her female students are more likely to believe that

boys are better than girls at math.

     "If these girls keep getting math-anxious female teachers in later grades, it may create a snowball

effect on their math achievement," Levine told Science News. The study suggests that if these girls

grow up believing that boys are better at math than girls are, then these girls may not do as well as they

would have if they were more confident.

     Just as students find certain subjects to be difficult, teachers can find certain subjects to be difficult to

learn-and teach. The subject of math can be particularly difficult for everyone. Researchers use the word

"anxiety" to describe such feelings: anxiety is uneasiness or worry. (Many people, for example, have

anxiety about going to the dentist because they're worried about pain.)

     The new study found that when a teacher has anxiety about math, that feeling can influence how her

female students feel about math. The study involved 65 girls, 52 boys and 17 first- and second-grade

teachers in elementary schools in the Midwest. The students took math achievement tests at the beginning

and end of the school year, and the researchers compared the scores.

     The researchers also gave the students tests to tell whether the students believed that a math superstar

had to be a boy. Then the researchers turned to the teachers: To find out which teachers were anxious

about math, the researchers asked the teachers how they felt at times when they came across math, such

as when reading a sales receipt. A teacher who got nervous looking at the numbers on a sales receipt, for

example, was probably anxious about math.

     Boys, on average, were unaffected by a teacher's anxiety. On average, girls with math-anxious

teachers scored lower on the end-of-the-year math tests than other girls in the study did. Plus, on the test

showing whether someone thought a math superstar had to be a boy, 20 girls showed feeling that boys

would be better at math-and all of these girls had been taught by female teachers who had math anxiety.

      According to surveys done before this one, college students who want to become elementary school

teachers have the highest levels of anxiety about math. Plus, nine of every 10 elementary teachers are

women, Levine said.

     This study was small, and it's often difficult to see large patterns in small studies, David Geary told

Science News. Geary, a psychologist at the University of Missouri in Columbia, studies how children

learn math. "This is an interesting study, but the results need to be interpreted as preliminary and in need

of replication with a larger sample," Geary said. That means that the results are just showing something

that might be happening, but more studies should be done. If more studies find the same trend as this one,

then it's possible that a teacher's anxiety over math really is affecting her female students.

1. Sian Beilock and Susan Levine carried out the new research in order to ______.

A. know the effects of teaching on learning      

B. study students' ways of learning math

C. prove women teachers are unfit to teach math  

D. find better teaching methods for teachers

2. The underlined part in paragraph 4 most probably means that girls may ______. 

A. end up learning math with anxiety from their teachers

B. study the ways their female teachers behave

C. have an influence on their math-anxious female teachers

D. gain unexpected achievement in such subjects as math

3. In the study, what were the teachers required to do?  

A. Prepare two math achievement tests for the students.

B. Tell their feelings about math problems.

C. Answer whether a math superstar had to be a boy.

D. Compare the students' scores after the math tests.

4. What is the finding of the new study?  

A. No male students were affected by their teachers' anxiety.

B. Almost all the girls got lower scores in the tests than the boys.

C. About 30% of the girls thought boys are better at math than girls.

D. Girls with math-anxious teachers all failed in the math tests.

5. Which of the following is TRUE according to the text?

A. 117 students and teachers took part in the new study.

B. The researchers felt surprised at the findings of their study.

C. Beilock and Levine are interested in teaching math.

D. Men teachers are better at teaching math than women teachers.