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institutions
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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.
单项选择题
A．5 billion years.B．4 billion years.C．4.5 billion years.D．5.4 billion years.
A．5 billion years.
B．4 billion years.
C．4.5 billion years.
D．5.4 billion years.
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