---Does Lucy enjoy singing?
---Yes, she does. I have never seen anyone else that is as ______ about singing as she is.A.worriedB.cautiousC.enthusiasticD.responsible
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C解析词义辨析。A. 担心的 B. 谨慎的C. 热情的D.负责的；有责任的。句意：露西喜欢 唱歌吗？——是的，他喜欢。我从没见过其它任何人像她那样对唱歌那样有热情。故选C。