According to the passage, lectures are ______. The passage describes an ideal lecture as ______.

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问题 According to the passage, lectures are ______.
The passage describes an ideal lecture as ______.

选项 A、giving a clear, general outline of the topic
B、helping students understand difficult points
C、having a clear purpose, focus, and development
D、being clearly spoken, interesting, and knowledgeable

答案C

解析
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