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Câu hỏi: * Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 43 to 50.

A. Volcanic Activity in the Ring of Fire

B. A Theory of Volcano Formation 

C. The problems with Plate Tectonic Theory 

D. The Role of Magma in Plate Tectonics.