单项选择题

The lobsters move ______.

A．w 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
A green building is often built on an area of land ______.
A．which has thick forests around
B．which has already been for buildings
C．where people of high income live
D．where was wasted by people
单项选择题
The best title for this passage is ______.
A．A General Introduction to the Library of Congress
B．The Building of the Library of Congress
C．The Library of Congress--the Americans' Pride
D．The Library of Congress--the world's Best Collection of Books
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