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
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
Choose the best title for this passage.
A．Unfit Presidents
B．President Who Set Slavery Free
C．Unknown Presidents
D．Famous President, Adams
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