单项选择题

After 1850,various states in the United States began to pass compulsory school attendance laws.

A. harsh
B. diversified
C. mandatory
D. complicated
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单项选择题
Most religions are concerned with the worship of one or several deities as well as with ethical rules of conduct.
A. faith
B. speech
C. thought
D. behavior
单项选择题
In statistics the most frequently used computations are the mean, the median, and the mode because all are indicators of central tendency.
A. graphs
B. variables
C. calculations
D. words
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