单项选择题

From 1968 to 1980，the size of the labor force increased by approximately what percent（）

A. 20%
B. 21%
C. 27%
D. 73%
E. 80%

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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

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

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