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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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

单项选择题

In the second paragraph, the underlined words the building most probably refer to ______.

A．an ordinary building
B．an energy-saving building
C．a green-colored building