A) Good conductors of electricity and heat', solid at room temperature; transparent shine brightly when polished.
B) Good conductors of electricity and heat; solid at room temperature; opaque except in extremely thin films; do not shine at all when polished.
C) Bad conductors of electricity and heat; solid at room temperature; opaque except in extremely thin films.
D) Good conductors of electricity and heat; solid at room temperature; opaque except in extremely thin films; shine brightly when polished.
Correct Answer: D
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