问题 选择题

下列属于物质化学变化的是                 

A.结晶法除去NaCl中少量的KNO3

B.气球充入过量的空气,爆炸

C.金属钠有强还原性,能与水反应

D.氯化氢溶于水生成盐酸

答案

C  

结晶法除去NaCl中少量的KNO3是利用的物质的溶解度的不同进行分离的;气球充入过量的空气发生爆炸是气体的压强过大而导致的;氯化氢溶于水生成盐酸是物质的溶解,都是涉及的是物质的物理性质。而钠与水反应生成了氢氧化钠与氢气,表现了钠的还原性质,属于化学变化。故答案为C

单项选择题
阅读理解

第三部分:阅读理解(满分40分,共20小题,每小题2分)

A

Britain almost more than any other country in the world must seriously face the problem of building upwards, that is to say, of accommodating a considerable proportion of its population in high-rise blocks of flats. It is said that an Englishman objects to this type of existence, but if this is so, he differs from most inhabitants of the world today.

In the past, blocks of flats have been associated with the lower income groups, and many of them lacked the obvious provisions, such as central heating, constant hot water supply, electrically operated lifts, and so on. Some even didn’t have facilities for disposal of dust and rubbish or storage places for baby carriages on the ground floor. Many lacked playgrounds for children on the top of their buildings, and drying grounds for washing. It is likely that the dispute regarding flats versus (对抗) individual houses will continue to rage on for a long time as far as Britain is concerned. And it is unfortunate that there should be hot feelings on both sides whenever this subject is raised. Those who oppose the building of flats base their cases primarily on the assumption (设想) that everyone prefers an individual home and garden and on the high cost per unit of accommodation. They, however, ignore the higher cost of providing full services to a scattered community and the cost in both money and time commuting to work for the suburban resident.

61. It can be inferred from the passage that ____.  

A. unlike most people in other countries, English people dislike living in flats

B. people in most countries of the world today like living in the suburbs

C. people in Britain are eager to move into high-rise blocks of flats

D. modern flats in Britain fail to provide the necessary facilities for living

62. What can we learn about the blocks of flats built in the past from the passage? 

A. They were conveniently located.          

B. The people who lived there were not rich.

C. They were usually not large enough for big families to live in.

D. The children who lived in them could play on the top of the buildings.

63. Some people don’t like living in flats because ____. 

A. they must pay much money             

B. they prefer to live in a house with a garden

C. there is no central heating and constant hot water supply

D. the disposal of rubbish is a problem for people living in flats

64. Some people don’t like living in suburban houses because ____.

A. the houses are not large enough

B. people who live in the suburbs must pay much money for the service work

C. people who live in the suburbs have to spend a lot of money and time traveling to work every day

D. it can be difficult for them to do some shopping and to get along well with their neighbors

65. This passage is mainly about __________. 

A. living in high-rise blocks of flats                

B. living in the suburbs

C. the difference in living in a flat in Britain and living in a flat in other countries

D. the attitude of British people towards living in flats