由短周期常见元素形成的纯净物A、B、C、D、E、F、X转化关系如下图所示（某产物已略去）：

已知：B、X为单质，常温下D为无色液体，A、B含同一种元素。

请回答下列问题：

（1）若E气体是大气污染物，F是一元强酸。

①写出E→F反应的化学方程式：                                    。

②现有25℃时0.1 mol·L^－1 A的水溶液，若向其中加入等体积0.1 mol·L^－1的稀硫酸，则所得溶液中各离子的物质的量浓度由大到小的顺序是                            。

③在常温下，向V₁ L pH＝a的A的水溶液中加入V₂ L pH＝b的盐酸，且a＋b＝14，若恰好完全反应，则V₁和V₂的关系为V_l    V₂（填“＞”、“＜”、“＝”或“无法确定”），等pH的所得溶液与盐酸比较，由水电离出的c(H^＋)前者为后者的10⁸倍，则两种溶液的pH＝      。

（2）若E气体不是大气污染物，F是二元弱酸。

①B所含元素在周期表中的位置                   。

②写出氧化铁与C反应的化学方程式：                              ；将少量气体E通入氢氧化钙溶液中得不溶物F，F的K_sp＝2.8×10^－9。现将该沉淀放入0.1 mol·L^－1的CaCl₂溶液中，其K_sp      （填“增大”、“减小”或“不变”），此时，组成不溶物F的阴离子在溶液中的浓度为             。

完形填空（共20小题；每小题1.5分，满分 30分）

阅读下面短文，从短文后所给各题的四个选项（A、B、C、和D）中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑

Traveling in Vietnam was like visiting a mysterious neighbor. You have lived next door to each other for years but know very    1_ about what happened on   2__ side of the fence.

I traveled there last August. A(n)   3   180-kilometre trip from a Chinese border town to Hanoi, the capital of Vietman,   4    an adventurous eight hours. That’s   5    the country still doesn’t have a modern expressway system. The major passage going through the country is only a two—way road.    6    , many areas are mountainous.

Vietnamese drivers are   7    and fearless. They compete with each other at full speeds no matter how scared the   8    feel. When the bus shook us violently for the hundredth time, the driver made a   9   to make us feel better. “See, this is just a(n)   10   Vietnamese people give you, a free massage(按摩) service.”

It was midnight   11   I reached that hotel. Switching on television, I was   12   by something: All the __13__ in the TV plays spoke in the same voice.   14   , modern Korean plays and historical Chinese plays are   15   with the Vietnamese. But it seemed they didn’t have enough   16   to dub(为…配音) all these programs. So, the same boring woman appears 17   every TV play to speak for the roles. The next morning when I opened the window, I found myself in a huge “   18   ”. The buildings in the streets were __19  in all kinds of colors you can imagine. Vietnamese are allowed to   20   their houses as they like. Each one was different. The large number of colors brought the city alive.

1. A. little                     B. much                C. a lot                         D. few

2. A. another      B. other         C. either              D. the other

3. A. long        B. simple        C. pleasant            D. easy

4. A. took              B. spent         C. paid              D .devoted 

5. A. why              B. when         C. because            D. where

6. A. Therefore         B.However       C. Also               D. Otherwise

7. A. wonderful   B. impatient            C. careful             D. helpless

8. A. passengers         B. policemen     C. drivers             D. passers-by

9. A. story       B. joke                C. promise            D. statement

10. A. gift             B. pleasure       C. competition        D. surprise

11. A. that             B. until          C. when             D. while

12. A. excited           B. embarrassed    C. disappointed        D. amazed

13. A. actresses         B. actors         C. characters          D. channels

14. A. At present  B. To be honest    C. Sure enough         D. Of course

15. A. satisfied          B. received       C. content             D. popular

16. A. time             B. budget         C. people              D. space

17. A. beside           B. under         C. over               D. behind

18. A. film             B. garden              C. book               D. cup

19. A. put              B. set           C. dressed             D. filled

20. A. rent       B. make         C. live                D. paint