When a student is called upon to answer a question in class, usually he/she is delivering a/an _______ speech.
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【单选题】听力原文:W: Why did you start rock climbing? M: Because the rocks were there. At 20 I spent most of my time rock climbing. At 25 I went for the first time to the Himalayas and climbed Nanga Parbat, one of...