单项选择题

In statistics, the mathematical mean is obtained by dividing the sum of a group of scores by the number of scores().

A. total
B. square
C. numerator
D. list

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单项选择题
A research center has been set up in this country.()

A. praised
B. established
C. reformed
D. criticized
单项选择题
Many visitors find the tempo of life here very difficult.()

A. kind
B. growth
C. speed
D. spectacle
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