题目: The girl glanced over her shoulder and found herself ______ by a young man in black. [ ]A. was followed B. followed C. following D. had been followed 答案: 答案:B
题型:选择题 刻画数据的离散程度的度量,下列说法正确的是( )(1)应充分利用所得的数据,以便提供更确切的信息;(2)可以用多个数值来刻画数据的离散程度;(3)对于不同的数据集,其离散程度大时,该数值应越小.A.(1)和(3)B.(2)和(3)C.(1)和(2)D.都正确 查看答案