单项选择题

According to the graph above， atapproximately what speed，in miles perhour(mph)，is the energy per distanceused in running approximately twice theenergy per distance used in walking（）

A. Between 6.5 and 7 mph
B. Between 5.5 and 6 mph
C. Between 4.5 and 5 mph
D. Between 3.5 and 4 mph
E. Between 2.5 and 3 mph

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单项选择题
In 1987 the average(arithmetic mean)population of the three most populous ofthe ten selected states was most nearly equal to（）

A. 18 million
B. 19 million
C. 20 million
D. 21 million
E. 22 million
单项选择题
From 1950 to 1985，the population of Country X increased by approximately how many million people （）

A、 45
B、 80
C、 165
D、 200
E、 It cannot be determined from the information given．
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