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
正确答案：A
42．答案为A根据第一段第二三句theearthatsometimeinitsveryearlyhistorybecamehotenoughtomeltthematerialsfromwhichitwasformedWhileinthismoltenstate作出该项选择
