单项选择题

A．Iron.
B．The Earth’s crust.
C．The minerals from the Mars.
D．Some unknown planet.
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单项选择题
A．Boys buy roses for their girlfriends.B．Students give Valentine cards to their mothers.C．People hold Valentine parties to celebrate the special day.D．Teachers award the good students with home-made cakes.
A．Boys buy roses for their girlfriends.
B．Students give Valentine cards to their mothers.
C．People hold Valentine parties to celebrate the special day.
D．Teachers award the good students with home-made cakes.
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