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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

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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.

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