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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Select the sentence within the paragraph that explains Barrett Browning’s inspiration for the title of her book of verse.
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°.
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