问题 选择题

已知: 分别代表不同种元素的原子,当两种物质在一定条件下能发生化学反应,用微观示意图表示为:

                                          

则下列说法正确的是

A.图示中的反应物都是单质

B.图示中共有3种化合物分子

C.该反应属于置换反应

D.该图示不含有非金属元素原子

答案

答案:B

考点:

专题:微观粒子模拟图型;化学反应模拟图型.

分析:根据反应的微观示意图可知,两反应物其中之一为不同种原子构成的化合物分子、另一反应物为同种原子构成的单质分子,而两种生成物都是由不同种原子构成的化合物的分子.

解答:解:A、图中所示的反应物中一种为不同种原子构成的化合物分子,另一种为同种原子构成的单质的分子,而非都是单质;故A不正确;

B、图示的四种物质的分子中除一种物质的分子为同种原子构成单质分子外,其余三种物质的分子皆为不同种原子构成的化合物的分子;故B正确;

C、据图示的反应,生成物中不存在同种原子构成的单质分子,反应不符合置换反应的特点不属于置换反应;故C不正确;

D、由图示的分子构成微观图,并不能看出原子是金属原子还是非金属原子;故D不正确;

故选B.

点评:由同种原子构成的分子为单质的分子,由该分子所构成的物质为单质;不同种原子构成的分子为化合物分子,由该分子构成的物质为化合物.

阅读理解

Britain’s symbolic red phone boxes have become out of date in the age of the mobile, but villages across the country are stepping in to save them, with creative intelligence. Whether as a place to exhibit art, poetry, or even as a tiny library, hundreds of phone boxes have been given a new life by local communities determined to preserve a typical part of British life. In Waterperry, a small village near Oxford, the 120 residents have filled the phone box next to the old house with a pot of flowers, piles of gardening and cooking magazines, and stuck poems on the walls.

They took control of the phone box when telecoms operator BT said it was going to pull it down, an announcement that caused such dissatisfaction that one local woman threatened to chain herself to the box to save it. “I’d have done it, “ insisted Kendall Turner. “It would have been heartbreaking for the village. “ Local councilor Tricia Hallam, who came up with the idea for the phone box’s change, said quite a few people would have joined her, adding, “ We couldn’t let it go because it’s a British symbol.”

Only three feet by three feet wide, and standing 2.51-meter tall, the phone boxes were designed by Giles Gilbert Scott in 1936 for the 25th anniversary of the reign of King George V. Painted in “Post Office red” to match the post boxes, they were once a typical image of England and the backdrop(背景) to millions of tourist photographs.

Eight years ago there were about 17,000 across Britain, but today, in a country where almost everybody has a mobile phone, 58 percent are no longer profitable and ten percent are only used once a month. “On average, maintaining them costs £800 a year per phone box-about £44 million annually,” said John Lumb, general manager for BT Payphones.

小题1:Some red phone boxes in Britain have been used for ____.

a. selling flowers    b. cooking   c. reading  d. exhibiting art or poetry

A.a, b

B.c, d

C.a,b,c

D.b,c,d小题2:Why do the villagers want to keep the red phone boxes?

A.Because millions of people visit Britain to see the red phone boxes.

B.Because the local people could earn a lot of money from the red phone boxes.

C.Because the red phone boxes have already become a symbol of Britain.

D.Because the red phone boxes may be useful for some people in emergency.小题3:What is the color of the British post boxes according to the passage?

A.Green

B.Red

C.Black

D.Yellow小题4:What is John Lumb’s attitude towards pulling down the red phone boxes?

A.supportive

B.Opposed

C.Neutral

D.Indifferent.

单项选择题