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.
单项选择题
A．How to find a place to live in.B．What kind of apartment you need.C．A dilemma: buying or renting a house.D．A good way to minimize house search.
A．How to find a place to live in.
B．What kind of apartment you need.
C．A dilemma: buying or renting a house.
D．A good way to minimize house search.
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