单项选择题

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
Why knights fought bravely to win kingdoms rich with diamonds
A．Diamonds are very valuable.
B．They want to become the richest man
C．They think it is more important to discover diamonds than to discover new lands.
D．They are eager for jeweled crowns.
单项选择题
Most diamonds can be found ______.
A．in Africa
B．in gravel at the bottom of rivers and streams
C．in desert sand
D．in or near meteorites
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