专四
A．exteriors
B．outside
C．surfaces
D．coverings
【点睛】词汇辨析题。D项指“遮盖物”，可首先排除；A、B两项虽都有“外部”之义，但并不强调物体的“外表而”故也应排除。
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根据以下资料，回答题：
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