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.

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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
单项选择题
23（）

A．which
B．that
C．one
D．all
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