单项选择题


In 1974 the dollar value of imports was approximately what percent of the dollar value of exports（）

A. 4%
B. 17%
C. 27%
D. 79%
E. 367%

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单项选择题
UNITED STATES POPULATION (official census 1890—1980) Year Population (in millions) 10-year Increase (in millions) Year Population (in millions) 10-year Increase (in millions) 1890 62.9 1940 131.7 8.9 1900 76.0 13.1 1950 150.7 19.0 1910 l 92.0 16.0 1960 179.3 28.6 1920 105.7 13.7 1970 103.2 23.9 1930 122.8 17.1 1980 223.9 20.7 If the percent increase in population from1910 to 1920 had been approximately thesame as the percent increase from 1900 to1910，the 10-year increase，in millions，from 1910 to 1920。 would havebeen approximately（）

A. 3
B. 6
C. 16
D. 19
E. 29
单项选择题
By approximately how many million did the mallard population decrease from 1970to 1988（）

A. 0.6
B. 2.8
C. 3.6
D. 4.3
E. 7.0
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