单项选择题

A．Because his watch has stopped.
B．Because his watch is slow.
C．Because his watch is fast.
D．Because his watch is lost.
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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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