Crowns are made of:
1 . gold
2 . porcelain
3 . gold and porcelain
a. 1 only
b. 2 only
c. 3 only
d. 1, 2, 3
d
RATIONALE: Crowns are made of: - gold - porcelain - gold and porcelain
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Fill in the blank(s) with the appropriate word(s).
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Fill in the blank(s) with the appropriate word(s).