单项选择题

Most animals move from one place to another at a certain time to ______.

A．give birth
B．enjoy warmer weather
C．find food more easily
D．find beautiful places
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单项选择题
The lobsters move______.
A．to the fresh water
B．to the sea floor
C．at a certain time
D．to find more food
单项选择题
The mice in northern Europe move when______.
A．they give birth
B．the weather is bad
C．the place gets too crowded
D．they haven't enough food
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