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
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
单项选择题
In fact, American people came to love Adams ______.
A．whether he was president or not
B．when he was not a president
C．before his term ended
D．when he first became a representative
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