单项选择题

According to the passage, the earth in its very early period was （）.

A．in molten state
B．in water state
C．in rock state
D．a vast ocean

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单项选择题
23（）

A．which
B．that
C．one
D．all
单项选择题
In 1999, the government spent about $ 39 billion to（）

A．improve the prison conditions
B．keep men and women in prison
C．build houses for prisoners
D．maintain the prisons
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