问题 单项选择题

X、Y、Z、M、W为五种短周期元素。X、Y、Z是原子序数依次递增的同周期元素,且最外层电子数之和为15;X与Z可形成X22分子;Y与M形成的气态化合物在标准状况下的密度为0.76g·L-1;W的质子数是X、Y、Z、M四种元素质子数之和的。下列说法正确的是()

A.原子半径:W>Z>Y>X>M

B.XZ2、X2M2、W2Z2均为直线形的共价化合物

C.由X元素形成的单质不一定是原子晶体

D.由X、Y、Z、M四种元素形成的化合物一定既有离子键,又有共价键

答案

参考答案:C

解析:

本题涉及元素推断的相关知识。Y与M形成的气态化合物的摩尔质量M=0.76g/L×22.4L/mol=17g/mol,结合X、Y、Z同周期且原子序数依次递增,且最外层电子数之和为15,则M为H,Y为N;再根据X、Z可形成XZ2分子,知X为C,Z为O;W的质子数为,则W为Na。原子半径:Na>C>N>O>H,A错;CO2、C2H2均为直线形的共价化合物,但Na2O2为离子化合物,B错;由碳元素形成的单质不一定是原子晶体,例如石墨为混合型晶体,C60为分子晶体,C对;氨基酸是由C、N、O、H形成的化合物,但只含共价键,不含离子键,D错。

阅读理解

For thousands of years, the most important two buildings in any British village have been the church and the pub.Traditionally, the church and the pub are at the heart of any village or town, where the people gather together to socialize and exchange news.

As a result, British pubs are often old and well preserved.Many of them have become historic sites.The most famous example is the pub in the city of Nottingham called " Ye Olde Trip to Jerusalem" , which dates back to the year 1189 AD and is probably the oldest pub in England.

However, British pubs are not just for kings and queens; they welcome people from all classes and parts of society.On a cold night, the pub's landlord or landlady can always find a warm place for you by the fire.There is always honest and hearty food and plenty of drinks available at an affordable price.

That's how things used to be.Things are beginning to change.It is said that the credit crunch (信贷紧缩) is causing 39 British pubs in a week to go out of business.People do not have enough spare money to spend on beer.Recently, the UK government banned smoking in all pubs, and that may also have affected the number of customers going to pubs.

This decline is happening despite the fact that in 2005 the UK government started to allow pubs to stay open after 11 p.m..Previously, with 11 p.m.as closing time, customers would have to drink quite quickly, meaning they sometimes got more drunk than they would if allowed to drink slowly.The British habit of drinking a lot very quickly is known as "binge drinking" , and it causes long-term health problems for people and problems with violent crime for communities.

In order to save their businesses, pubs are trying to change with the market.British pubs now offer something for everyone.A lot of pubs used to be "Working Men's Clubs" , meaning that women could not usually enter.Today, however, women can freely enter 99% of pubs without experiencing any problems.Perhaps things are changing for the better after all.

小题1:British people have the habit of gathering in the pubs to _____.

A.have the hearty food

B.enjoy the historic sites

C.make themselves known

D.communicate with each other小题2:The British pubs are allowed to stay open after 11p.m.to ______.

A.urge customers to drink quickly

B.affect the number of customers

C.help reduce social problems

D.give pub owners better income小题3:We can learn from the last paragraph that the author _____.

A.is against the admission of too many women to the pubs

B.holds an optimistic attitude towards the future of the British pubs

C.thinks that women in the pubs will cause less social problems

D.holds the view that British pubs should offer everything you need小题4:The passage mainly tells us ______.

A.the long history of British pubs

B.the present situation of British pubs

C.the reason why British people go to pubs

D.the disadvantages of running pubs in Britain

多项选择题