在统计中，对客观现象进行计量的结果称为（）。
A.指标
B.变量
C.观察值
D.统计数据
参考答案：D
解析：统计数据是对客观现象进行计量的结果。
(2013·厦门质检)Hardly ________ twelve when they realized that it was too late to catch the last train.
A．the clock had struck
B．the clock had been struck
C．had the clock been struck
D．had the clock struck
I can sing ______ dance. [ ]
A. and
B. or
C. but
D. so
