7、 This might seem like a rather _____ topic that has no relevance to students, yet after some further discussion and explanation, students got to make it out.
(A) molten (B) robust (C) lucrative (D) abstruse
(A) molten-to melted by being heated with very high temperatures (B) robust-strong, unlikely to break (C) lucrative-profitable (D) abstruse = esoteric = arcane= recondite
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