运行下面的程序后，所得到的M值是（）M=0N=0DO WHILE N>M M=M+NN=N-10ENDDO？M

A:-10 C:10 D:100

RWYTURN-0FF（跑道转弯）电门在0N位，何时该灯点亮？（）

A:前起落架收回时 B:前起落架放下锁好时 C:一直点亮 D:.三个起落架都放下收上

Mind Those Manners 0n the Subway So，there you are，just sitting there in the subway Car，enjoying that book you just but_____(46)Or the person sitting next t0 you takes out a nail clipper(指甲刀)and begins cutting his 0T her nails． AnnoyingMany 0f us have to spend some time every day 0n public transportation_____(47)So,to make the trip more pleasant．we suggest the following：Let passengers get off the bus 0T subway Car before you can get 0n_____(48)Stand away from the doors when they are closing Don’t talk loudly on a bus oT subway．Chatting loudly with your friends can be annoying t0 others_____(49)Don’t think your bags and suitcases(手提箱)deserve a seat 0f their own．Use a tissue whenever you cough 0r sneeze(打喷嚏)．An uncovered sneeze can spread germs(细菌)，especially in crowded places．Don’t cut your nails 0r pick your nose on public transportation．Don’t read over other people’s shoulder_____(50)It can make people uncomfortable．They might think you’re too stingy(小气的)even t0 buy a newspaper．0r they might think you’re judging their behavior．

A:Don’t eat food in your Car． B:Don’t shout into your mobile phone on a bus 0r subway． C:We all know that some behaviors are simply unacceptable D:Many people d0 this on subways，but it’s really annoying E:Getting off and 0n in an orderly manner can save time for all． F:Suddenly。you feel someone leaning over your shoulder reading aiong with you

It would( )0n what is on the list．

A:be depend B:depending C:depended D:depend

在当前工作区已经打开选课数据库，其中包括课程号、学号、成绩字段。不同的记录分别有重复的课程号或重复的学号。要使用COUNT命令计算有学生选修的不同课程有多少、应在执行COUNT命令之前使用命令( )。

A:INDEX 0N学号TO GC B:INDEX 0N课程号TO CC C:INDEX 0N学号TO GG UNIQUE D:INDEX 0N课程号TO GG UNIQUE

在当前工作区已经打开选课数据库，其中包括课程号、学号、成绩字段。不同的记录分别有重复的课程号或重复的学号。要使用COUNT命令计算有学生选修的不同课程有多少、应在执行COUNT命令之前使用命令( )。

A:INDEX 0N学号TO GC B:INDEX 0N课程号TO CC C:INDEX 0N学号TO GG UNIQUE D:INDEX 0N课程号TO GG UNIQUE