单项选择题


How many of the inventoried textbooks were purchased by the two schools combined during the years 1974，1975and 1976（）

A. 495
B. 940
C. 1，020
D. 1，435
E. 2，800

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单项选择题
In 1970，if 5 percent of the water use was for domestic purposes．approximately what was the daily average number of gallons of water used per capita for domestic purposes（）

A. 105
B. 50
C. 20
D. 10
E.5
单项选择题
Family X’s gross income is the sum of M r．X’s income and Mrs．X’s income．In1983 Mr．and Mrs．X each had an income of $25，000．If Mr．X’s income increased by 10 percent from 1983 to 1984，by what percent did Mrs．X’s income decrease for the same period（）

A. 10%
B. 15%
C. 20%
D. 25%
E. 30%
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