单项选择题

It can be learned from the passage that about four billion years ago （）.

A．the earth was in molten state
B．the earth surface temperature was above 100℃
C．the earth surface temperature was below 100℃
D．rain water could remain on the earth

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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

单项选择题

Which of the following statements about Leopold and Rudolph Blaschka is TRUE（）

A．They were brothers.
B．They were artists.
C．They were florists.
D．They were farmers.