问题 选择题

阿伏伽德罗常数用NA表示,则下列叙述中正确的是(  )                                                   

A.0.1 mol Na2O2中所含的阴离子数为0.2NA

B.常温常压下,5.6 g N2和CO混合物中所含有的原子总数为0.4 NA

C.标准状况下,2.24 L H2O中含有的氧原子数目为0.1 NA

D.Cu和足量的浓硫酸反应产生4.48 L气体时,转移的电子数为0.4 NA

答案

答案:B

过氧化钠中阳离子和阴离子的个数之比是2︰1的,所以A中应该含有0.1mol阴离子,不正确。氮气和CO的相对分子质量相同,所含有的原子数也相同,所以选项B是正确的。标准状况下,水是液体,不适用于气体摩尔体积,C不正确。铜和浓硫酸反应中产生的气体是SO2,每生成1molSO2,反应中只转移2mol电子,D不正确。答案选B。

选择题
阅读理解

When I put a foot in the school for the first time, the thing that I will never forget is a big smile coming from the people of the reception. This is the kind of things that means a lot to you when you are feeling like a strange person in a country that you have never been, as it was in my case.

In the classes, I don’t know if I’m a lucky person, but the teachers that I have had, in my opinion, are excellent, very professional in their jobs, and they just seem to enjoy teaching, and make the lessons useful and classes amusing.

Another fact that I’ve really enjoyed is that the school is not only aimed at the English language knowledge. You can also find every kind of activity intended to entertain the students in their free time, with things like going to museums and galleries, visiting special places in the city or going to the very famous pub night to have a few beers with your friends. So here you have the opportunity to enjoy the stay in London, to meet new friends, and also to learn everything about the city and the British culture.

Personally, there are some facts that have not been easy for me since I arrived, like being so far away from my family, the differences between English food and the food I used to eat, and the high prices for everything. However, I am impressed about a very developed and multicultural city, with people aware of the sense of living in community, with a public transport amazingly thorough, with outstanding tourist places, with opportunities for work and with food from every part of the world that you can imagine.

I’ve experienced something priceless with my friends in London. Every time I made contact with my friends from another country, I learn about their culture. I was lucky to have such good friends. I think that time was a present for me.

小题1:What is the passage mainly about?

A.The author’s learning experience in London.

B.The friends the author made while in London.

C.The author’s progress in learning English.

D.The poor memories in a foreign country.小题2:When setting foot in the new country, the author ________.

A.felt the great pressure from foreigners

B.was uneasy in the unfamiliar environment

C.missed everything and everyone in his back home

D.had difficulty dealing with different cultures and customs小题3:Which of the following statements is TRUE according to the passage?

A.The author’s experience in London is worthless.

B.Schools in London focus on no activities.

C.The author had some difficulty in adapting to the life in London.

D.The teachers are easily confused by the international students.小题4:What did the author do besides his studies while in London?

A.He learned the differences between languages.

B.He got to know the city with different cultures.

C.He served at many outstanding tourists places.

D.He made contact with friends from his home.