答案:C
解析:
Only "lightness" fits the logic of the sentence as being contrary to the "gravity" of the topic. Listening to others discuss a grave (or serious) topic in a light-hearted tone would be unsettling and confusing.
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答案:C
解析:
Only "lightness" fits the logic of the sentence as being contrary to the "gravity" of the topic. Listening to others discuss a grave (or serious) topic in a light-hearted tone would be unsettling and confusing.