但氧气含量低于（）%时，煤尘就不会发生爆炸。A、21 B、20 C、18 D、17

Is the customer always right The answer, it seems, depends on which country you are in. Shopping is very much a part of a country’s culture, and attitudes to shopping and consumers vary from country to country just as much as climate or taste in food. From the air-conditioned American shopping centers to the street market of African towns, the way we shop shows the way we see ourselves and our relationships with other people.
Business competition in Europe has given consumers increased power. This has meant falling prices, plenty of special offers and a re-examination of what customer service really means. People often point to America as an example of excellent customer service. In restaurants in the south of the USA, for example, waiters compliment you on your clothes, ask about your day, compliment you on the wisdom of your order and then return every ten minutes to refill your glass and make sure that everything is to your satisfaction.
Anyone who has waited 30 minutes to be served in a restaurant might well dream of such attention, but do Europeans really want US style service As a friend of mine once told me, "By the end of the evening I had spent as much time talking to the waiter as to my wife. " It is a question of expectations. Different nationalities expect different types of service.
A Chinese-American friend loves telling people about how her Chinese mother shops for clothes: "First of all she waits until they are on sale, then she bargains until she gets an even better price and then she finds some small fault with the product and demands a further reduction. She never buys anything at the regular price. " Could you imagine trying such tricks in a department store in your country
Attitudes to service are, of course, affected by employers’ attitudes to their workers. As American sales and service personnel are heavily reliant on commission and tips, they have more motives to provide more service. But is this fair Do we think it is fair to ask shop assistants to work late evenings, Sundays and 12 hour shifts It might not be a case of "Is the customer always right" but a case of "How much service is it fair to expect\

According to the last paragraph, the service quality of American service personnel may depend on ______.

A. the customers’ attitude towards them
B. their working experience
C. the length of their working hours
D. the amount of commission and tips

远古人类在漫长的发展过程中，掌握一定的生产技术是他们赖以生存的基础。下列能说明山顶洞人比北京人进步的是[ ]

A．制造和使用工具

B．使用天然火

C．普遍使用制造石器

D．懂得人工取火

下列文件中，由总监理工程师主持编制并报监理单位技术负责人批准后实施的文件是（）。

A.监理规划

B.监理实施细则

C.监理大纲

D.监理月报

When I was thirteen, my family moved from Boston to Tucson, Arizona. ___36___ the move, my father ___37___ us in the living-room on a freezing January night. My sisters and I sat around the fire, not ___38___ that the universe would suddenly change its course. “In May, we’re ___39___to Arizona.”

The words, so small, didn’t seem ___40___ enough to hold my new life. But the world changed and I awoke on a tram moving across the country. I watched the ___41___ change from green trees to flat dusty plains to high mountains as I saw strange new plants that ___42___ mysteries(奥秘) yet to come. Finally, we arrived and ___43___ into own new home.

___44___ my older sisters were sad at the loss of friends, I ___45___ explored(探索) our new surroundings.

One afternoon, I was out exploring ___46___ and saw a new kind of cactus(仙人掌). I crouched (蹲) down for a closer look. “You’d better not ___47___ that.”

I turned around to see an old woman.

“Are you new lo this neighborhood?” I explained that I was, ___48___, new to the entire state.

“My name is Ina Thorne. Have you got used to life in the ___49___? It must be quite a ___50___ after living in Boston.”

How could I explain how I ___51___ the desert? I couldn’t seem to find the right words.

“It’s vastness,” she offered. “That vastness ___52___ you stand on the mountains overlooking the desert — you can ___53___ how little you are in comparison with the world. ___54___, you feel that the possibilities are limitless.”

That was it. That was the feeling I’d bad ever since I’d first seen the mountains of my new home. Again, my ___55___ would change with just a few simple words.

“Would you like to come to my home tomorrow? Someone should teach you which plant you should and shouldn’t touch.”

36. A. During B. Until   C. Upon  D. Before

37. A. gathered      B. warned       C. organized   D. comforted

38. A. hoping B. admitting   C. realizing     D. believing   

39. A. going   B. moving      C. driving       D. flying

40. A. good    B. simple C. big     D. proper      

41. A. picture  B. ground       C. sense   D. area

42. A. suggested     B. solved C. discovered  D. explained

43. A. settled  B. walked       C. hurried       D. stepped

44. A. If  B. After   C. once   D. While

45. A. bitterly B. easily  C. proudly      D. eagerly

46. A as well   B. as usual      C. fight away  D. on time

47. A. move   B. dig     C. pull    D. touch

48. A. of course     B. in fact C. after all      D. at least

49. A. desert   B. city     C. state    D. country

50. A. luck     B. doubt  C. shock  D. danger

51. A. found   B. examined   C. watched     D. reached

52. A. why     B. when  C. how    D. where

53. A. prove   B. guess  C. sense   D. expect

54. A. However     B. Otherwise   C. Therefore   D. Meanwhile

55. A. idea     B. life     C. home  D. family 

查封、扣押的期限最多不得超过（）日。

A、七

B、十五

C、三十

D、六十