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 first step in starting the Library of Congress was ______.
A．buying Thomas Jefferson's books
B．buying books from England
C．putting up the library building
D．asking experts in every field to work there
单项选择题
When Holowka says in the last paragraph, It's going to be big , she means that green buildings ______.
A．will be more comfortable
B．will become popular in future
C．will be more environmentally friend
D．will be more bigger than before
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