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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
answer is D.
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