单项选择题

A．5 billion years.
B．4 billion years.
C．4.5 billion years.
D．5.4 billion years.
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单项选择题
A．Visit friends.B．Clean the house.C．Stare at the walls.D．Enjoy their hobbies.
A．Visit friends.
B．Clean the house.
C．Stare at the walls.
D．Enjoy their hobbies.
填空题
O
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