单项选择题

Which of the following statements about state and local government employees can be inferred from the data（）
Ⅰ Fewer than of those in paraprofessional occupations were males．
Ⅱ There were more than 5 times then umber of females in the technical occupations as in the skilled craft occupations．
Ⅲ There were more than 6 times the number of females in the professional occupations as in the official/administrative occupations．

A. Ⅰ only
B. Ⅱ only
C. Ⅰ and Ⅱ only
D. Ⅱ and Ⅲ only
E. Ⅰ，Ⅱ and Ⅲ

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单项选择题

If in 1900 the water use in Country K was the same as that in Country X，but increased at the constant rate of 3 billion gallons every year，then the two countries would again have had the same water use in approximately what year（）

A. 1910
B. 1920
C. 1930
D. 1940
E. 1950

单项选择题

If 5 points were added to each score，which of the following would NOT be affected（）

A. The highest score
B. The mean for all scores
C. The median for the seniors’ scores
D. The mode for the iuniors’ scores
E. The standard deviation for all scores