单选题

单选题 Each of the following is a valid conclusion that can be drawn from the information in the graphs EXCEPT:

A、 from 1970 to 1980, the number of stores increased by approximately 200
B、 from 1970 to 2000, the number of stores approximately doubled
C、 from 1980 to 2000, the average number of employees increased by approximately 50%
D、 in 2000, there were about 75,000 employees
E、 (E) from 1970 to 2000, the number of employees increased each decade

【正确答案】 E

【答案解析】According to the graph, the slope of the line segment between the number of employees in 1970 and the number of employees in 1980 is negative (slopes down). Thus the number of employees decreased between 1970 and 1980; the statement "From 1970 to 2000, the number of employees increased each decade" is therefore false.

单选题 According to the graphs, which of the following is the best estimate of the total number of employees in 1990?

A、 75,OOO
B、 62,000
C、 57,000
D、 50,000
E、 (E) 48,000

【正确答案】 C

【答案解析】According to the graph, the number of employees in 1990 is slightly below the line representing 60,000 employees. Thus 57,000 is the logical answer choice.