单项选择题

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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单项选择题
A．He fixes bicycles.B．He raises sheep.C．He sells chairs.D．He’s a gardener.
A．He fixes bicycles.
B．He raises sheep.
C．He sells chairs.
D．He’s a gardener.
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