第18题: [单项选择]Very. few people could understand the lecture the professor delivered because its subject was very ______. A. intriguing B. indefinite C. obscure D. dubious 参考答案:C 答案解析:[解析] 考查形容词辨析。题目说没有几个人明白教授的讲座,证明它太难以理解,obscure意为“晦涩的。费解的”,强调“难以理解”这个含义,为正确答案,又如:This poem is obscure.