单项选择题

The lobsters move ______.

A．w the fresh water
B．to the sea floor
C．at a certain time
D．to find more food
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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
单项选择题
What is the main idea of the passage
A．Animals move in order to find food more easily.
B．The migration of the fish called "salmon" is the most famous migration.
C．Living things move from one place to another because they like to travel.
D．Sometimes we know why and how living things move from one place to another, but sometimes we don't.
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