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
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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
When Adams served as the sixth U.S. president, ______.
A．his people didn't regard him as a great man
B．he tried a lot of means to get rid of slavery
C．his high ideal made an impression on American people
D．he did a lot of things against laws
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