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
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单项选择题
How many colleges allow you to get in touch with them through toll free telephone(免费电话)
A．Four.
B．Three.
C．Two.
D．One.
单项选择题
When is the main subject discussed in the text
A．Dettling designed the first green building in the U. S.
B．Energy shortage calls for buildings of new design.
C．Green building help save environment.
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