单项选择题
A．crownB．industrial diamondsC．shirtD．coatExcept jewelry……
Except jewelry, diamonds can be used as ______.
A．crown
B．industrial diamonds
C．shirt
D．coat
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单项选择题
Diamonds are so hard that only _____ can cut it.
A．a man who knows all about diamonds
B．diamond-edged tools
C．a special cutter
D．diamond cutter
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