问题 阅读理解

On the whole, it’s not something we parents shout about, but one in four of us does it. Hiring private tutors for our children is now widespread.

“It’s expensive, but worth it,” says Ashan Sabri, whose daughter Zarreen, is having tuition in biology and chemistry in preparation for A-levels this summer. “My husband and I tried to tutor her at home, but we found all our knowledge was out of date and we were only confusing Zarreen. We also tried a group revision course but all the children were sitting in a room for different kinds of exams. On the whole, we think one-to-one tuition works best.”

The real reason is: does tutoring do any good?

“It’s not the magic bullet,” says Professor Judith Ireson, author of a 2005 Institute of Education report on the subject. “It’s still up to the child to do the learning. If he or she isn’t interested, sending them to a private tutor won’t do any good. However, we did find that students who had private tuition in mathematics during the two years before GCSE achieved on average just under half a grade higher than students who did not have a tutor.”

In which case, surely it’s time to break open the champagne? Not necessarily, says Elaine Tyrrell, head of The Rowans School, Wimbledon, a preparation school which regularly gets children into the best private schools.

“While we recommend private tutoring for a few children whose first language isn’t English, we don’t encourage it for the others. With the level of education they get here, children really ought to be able to pass the entrance exams without any extra teaching. And our worry is that they might just get used to getting help from last-minute tutoring, but, once they actually get to that school, they won’t be able to cope.”

But Mylene Curtis, owner of Fleet Tutors, one of the biggest tutoring agencies in the country, holds a different view.

“In some respects, the hurdles children have to leap in order to get into these schools are set at a higher level than the reality,” says Curtis. “We often find that, once a child has got into a school, the standard of work isn’t as high as was feared. The trick is to do well enough in the exam to win a place.”

小题1:What does Ashan Sabri think of the group revision course?

A.It’s expensive but worthwhile because it works the best.

B.It confuses students because the knowledge taught in it is out of date.

C.It isn’t effective because it doesn’t focus on specific exams.

D.It is effective because it doesn’t focus on specific exams.小题2: What do the underlined words “magic bullet” in Paragraph 4 mean?

A.Something that cannot help to solve problems at all.

B.Something that solves a difficult problem in an easy way.

C.Something that seems useful but has no use at all.

D.Something that encourages interest in study.小题3:According to Elaine Tyrrell, private tutoring is _______.

A.effective in language learning but not for exams

B.effective for foreign students but not for local students

C.unnecessary in most cases and may harm the further study of students

D.unnecessary in secondary school but helpful to further study小题4: What can be inferred from the last two paragraphs?

A.Fleet Tutors and the Rowans School are competitors.

B.Entrance exams to schools are too difficult for most students.

C.Further study isn’t as difficult as was first thought.

D.Private tuition is worth the financial investment.小题5:What attitude does the author hold towards home tutoring?

A.Critical

B.Objective

C.Supportive

D.Uninterested

答案

小题1:C

小题2:B

小题3:C

小题4:C

小题5:B

多项选择题
问答题

火力发电厂释放的燃煤废气中含有大量的氮氧化物(NOx)、二氧化硫和二氧化碳等气体会造成环境污染.对燃煤废气进行脱硝、脱硫和脱碳等处理,可实现绿色环保、节能减排、废物利用等目的.

(1)脱硝.利用甲烷催化还原NOx,反应如下:

CH4(g)+4NO2(g)=4NO(g)+CO2(g)+2H2O(g);△H1=-574kJ•mol-1

CH4(g)+4NO(g)=2N2(g)+CO2(g)+2H2O(g);△H2=-1160kJ•mol-1

在一定条件下,甲烷直接将NO2还原为N2的热化学方程式为:______.

(2)脱碳.将CO2转化为甲醇的热化学方程式为:

CO2(g)+3H2(g)

CH3OH(g)+H2O(g);△H3

①在1L的密闭容器中,充入1molCO2和3molH2,在一定温度下,进行上述反应.测得CO2和CH3OH(g)的浓度随时间变化如图所示.

则0~10min内,H2的平均反应速率为______;达到平衡时,CO2的转化率为______;该温度下该反应的 K=______.

②取五份等体积CO2和H2的混合气体(物质的量之比均为1:3),分别加入温度不同、容积相同的恒容密闭容器中,发生上述反应,相同时间后,测得甲醇的体积分数φ(CH3OH)与反应温度T的关系曲线如图所示,则上述反应的△H3______0(填“>”、“<”或“=”).

(3)脱硫.某种脱硫工艺是将废气经处理后,与一定量的氨气、空气反应,生成硫酸铵和硝酸铵的混合物作为副产品化肥.设燃煤废气中的SO2、NO2的物质的量之比为1:1,则该反应的化学方程式为:______.

(4)硫酸铵和硝酸铵的水溶液的pH<7,其原因是______(用离子方程式表示).