As the Beijing Olympics logo says,‘One world,One dream’,China has provided best services for the competitors and ________. A. interpreters B. receptionists C. spectators D. volunteers 答案:Cspectator“观众”。句意:正如北京奥运会的口号“同一个世界,同一个梦想”所说的那样,中国已经向参赛者和观众提供了最好的服务。volunteer“志愿者”是提供服务的,而不是接受服务的,所以应该排除。interpreter“翻译员”,receptionist“招待员”。 样本101,98,102,100,99的标准差为( )
A. B.0
C.1
D.2