当低层建筑的层数不超过4层时，楼梯间的首层对外出口可设置在离楼梯间不超过( )m处

完形填空（共20小题；每小题1分，满分20分）

阅读下面短文，从短文后所给的四个选项A、B、C、D中,选出可以填人空白处的最佳答案，并在答题卡上将该项涂黑。

Once a group of tourists who were staying at a hotel in Birmingham were having dinner in the restaurant. Fish was brought in and while they were   16  it, some of them told interesting stories about  17  pearls and other   18   things inside fish.

An old gentleman, who up to now had   19   quietly to their conversation, at last said,

“ I’ve heard all your stories, now I’ll tell you   20  . When I was a young man I was working in a large importing factory in New York, and   21   is usual with young persons, I fell in   22   with a pretty young girl. Very __23__ we were engaged（订婚）. About two months __24___ our marriage was to take place, I was suddenly   25  to Birmingham on a very important business. I left my sweetheart,   26   to write to her. ”

“ I had to stay in Birmingham longer than I had   27  . At last my work was done and I could leave Birmingham. But just before I  28  New York, I bought a beautiful and very expensive diamond   29  , planning to give it to my sweetheart. ”

“ On my way to New York, I was__30___ the morning newspaper, which had been brought on board by the sailor. Suddenly I   31   an announcement of my sweetheart’s   32   with another. This made me so angry that I threw the ring overboard. A few days  33  , when I was eating fish, I bit(咬) on something   34  . What do you think it was ? ”

“ The diamond ring, ” cried his companions. “ No ” , said the old gentleman  35  , “ it was a fish-bone.”

16. A. eating       B. cooking          C. peeling        D. weighing

17. A. exchanging     B. tasting                 C. finding          D. searching

18. A. valuable                    B. terrible                 C. common                D. cheap

19. A. sat                    B. listened                C. stood                      D. thought

20. A. one                       B. all                     C. some                D. another

21. A. it                  B. which                          C. that                        D. as

22. A. trouble             B. debt                               C. quarrel                            D. love

23. A. quickly              B. fast                       C. soon                 D. lucky

24. A. when                    B. before                         C. after                 D. since

25. A. reported                   B. sent             C. caught           D. taken

26. A. promising                 B. agreeing              C. refusing                 D. wishing

27. A. regretted            B. wondered                  C. expected       D. finished

28. A. left for              B. left to                          C. returned back   D. returned from

29. A. watch               B. ring                       C. earring                            D. necklace

30. A. looking at       B. looking up                  C. looking through   D. looking for

31. A. looked              B. saw                       C. heard                     D. recognized

32. A. marriage                  B. fight                            C. talk                         D. agreement

33. A. before              B. later                          C. earlier              D. ago

34. A. hard                           B. sweet                         C. soft                         D. crisp

35. A. happily             B. loudly                    C. angrily             D. sadly 

在地球之外，究竟有没有外星人两位美国学者花了五年时间，在北半球天空______到了37个可能是来自地球外文明的信号。他们利用直径为26米的射电望远镜，______由浩瀚宇宙深处发出的未知信号。他们以波长21厘米和10.5厘米的电波对北半球天空的全部区域分别进行了三次和两次调查。 填入横线部分最恰当的一项是( )。

A．捕捉 观察

B．截取 寻找

C．捕捉 寻找

D．截取 观察

在自然因素的作用下岩石矿物发生的物理和化学的变化称为（）

A.物理风化

B.化学风化

C.生物风化

D.岩石风化

企业安全文化不具有（）

A.广泛的社会性

B.企业安全文化具有超前性

C.丰富的知识性、鲜明的目的性

D.法律强制性

引进浅冷装置（）阀门应在允许启动附属设备灯亮打开。

A.压缩机入口

B.润滑油泵前后

C.射流器入口管线上的

D.平衡气线上紧急填充气