题目

In the film The Little Tramp, Chaplin cuts off the laces of the shoes and eats them ______ they were noodles. A . if only B . even if C . ever since D . as if 答案：D 容量为100的某个样本数据分成10组，并填写频率分布表，若前7组频率之和为0.79，则剩下3组的频率之和为 [　　] A．0.21％ B．0.21 C．21 D．无法确定