1993年以来，我国内蒙古地区经常出现沙尘暴，造成重大经济损失。有人认为，沙尘暴是由于气候干旱造成草原退化、沙化而引起的，是天灾，因此是不可避免的。 以下各项如果为真，能够对上述观点提出质疑，除了( )。

A．上世纪50年代，内蒙古锡林郭勒草原的草有马肚子那样高，现在的草连老鼠都盖不住

B．在内蒙古呼伦贝尔和锡林郭勒退化草原的对面，蒙古国草原的草高达1米左右

C．在几乎无人居住的中蒙10公里宽的边界线上，草依然保持上世纪50年代的高度

D．沙尘暴增多主要是由于超载放牧、对草原掠夺性经营等人为因素造成的

My parents operated a small restaurant in Seattle. It was open twenty-four hours a day, six days a week. And my first real job，when I was six years old，was   36    the diners’ shoes. My father had done it when he was young，so he taught me   37   to do it efficiently(有效地)，telling me to   38   to re-shine(再擦亮) the shoes if the customer wasn’t    39 .

Working in the restaurant was a cause of great   40  because I was also working for the good of the family. But my father   41  that I had to meet certain standards(标准) to be part of the team. I   42   to be punctual(守时的)，hard-working，and polite to the    43 .

I was   44   paid for the work I did at the restaurant. One day I made the mistake of advising Dad that he   45  give me $10 a week. He said,“OK. How about you paying me for three meals a day you have here? And for the times you bring    46  your friends for free soft drinks?” He   47   I owed him about $40 a week.

I remember returning to Seattle after being    48  in the US Army for about two years. I had just been promoted(升迁) to Captain at that time. And full of pride，I walked into my parents’ restaurant，but the   49  thing Dad said was，“How about your   50   up tonight?” I couldn’t   51  my ears! I am an officer in the Army! But it didn’t   52   as far as Dad was concerned，I was just   53   member of the team. I reached for the mop(拖把). Working for Dad has taught me the devotion to a   54    is above all. It has nothing to do with   55   that team is involved in a family restaurant or the US Army.

36

A. cleaning          B. shining        C. removing       D. keeping

37.

A. why                B. what           C. when           D. how