单项选择题



The cost of books and materials accounted for approximately 30% of the school district’s annual expenditures. In 1990, what was the approximate average cost per student for books and materials

A．$1,500
B．$2,000
C．$3,000
D．$6,000
E．It cannot be determined from the given information.
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单项选择题
Triangle ABC shown above is an isosceles triangle. Which of the following statements individually provide(s) sufficient additional information to determine the measure of angle B Select all such statements.
A. The measure of angle A is 80°.B. The measure of angle C is 50°.C. The measure of angle A is 80° and the measure of angle C is 50°.
单项选择题
When the average of a list of course grades is multiplied by the number of courses, the result is n. What does n represent
A. Half the number of courses
B. Half the sum of course grades
C. The number of courses
D. The average of the course grades
E. The sum of the course grades
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