SINCE THEIR APPEARANCE, BOOKS ARE A PRECIOUS ____ OF KNOWLEDGE AND...

30. - DE THI MAU KHONG DAP AN 2014 MÔN TIẾNG ANH
Tiếng Anh DE THI MAU KHONG DAP AN 2014 MÔN TIẾNG ANH
30. Since their appearance, books are a precious ____ of knowledge and pleasure.A. source B. pile C. amount D. resourceMark the letter A, B, C, or D on your answer sheet to indicate the word or phrase that is closest onmeaning to the underlined word in each of the following questions.