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
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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
单项选择题
When is the main subject discussed in the text
A．Dealing designed the first green building in the U.S.
B．Energy shortage calls for buildings of new design.
C．Green building help save environment.
D．Green building is popular among people.
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