单项选择题

A．essential
B．available
C．reliable
D．dependent
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单项选择题
A．generatedB．evolvedC．bornD．originated
A．generated
B．evolved
C．born
D．originated
单项选择题
A．The Rhythmic Cycle of the Sun and the TideB．Discoveries in BiologyC．A Scientific StudyD．A Living Clock
A．The Rhythmic Cycle of the Sun and the Tide
B．Discoveries in Biology
C．A Scientific Study
D．A Living Clock
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