80.It is quite vital for a qualified teacher to have good manners and knowledge.

A. extensive

B. expansive

C. expensive

D. intensive

正确答案：A

解析：

80.【翻译】一名合格的老师要拥有良好的举止和渊博的知识，这是十分重要的【精析】A extensive:广泛的，广博的；expansive:广阔的，辽阔的；expensive:昂贵的，花钱多的;intensive:彻底的，密集的根据句意可知，选A。

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