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.
单项选择题
A．When hunting for food.B．When sleeping.C．When being attacked.D．When communicating with their cousins.
A．When hunting for food.
B．When sleeping.
C．When being attacked.
D．When communicating with their cousins.
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