My father often _____newspapers at aroun

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问题选择题

My father often _____ newspapers at around in the evening. [ ]

A. read

B. reads

C. reading

D. to read

答案

答案：B

单项选择题

已知环比增长速度为5.5%、4.6%、3.1%、2.5%，则定基增长速度为（）。

A.5.5%×4.6%×3.1%×2.5%

B.（5.5%×4.6%×3.1%×2.5%）-100%

C.105.5%×104.6%×103.1%×102.5%

D.（105.5%×104.6%×103.1%×102.5%）-100%

单项选择题

在整理分析资料时，欲知道一组观察值的变异程度，常计算

A．百分率
B．平均值
C．标准误
D．标准差
E．构成比