单项选择题

A green building is __ to have reduced its environmental impact by 60% compared with an equivalent conventional building.(60)

A．established
B．estimated
C．computed
D． counter
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单项选择题
That caves of Altamira, which were __ in northern Spain, contain interesting paintings by early cave dwellers.
A．found
B．invented
C． discovered
D．created
单项选择题
A professional degree will __ an average annual income of about twice that of college graduates.
A． feel like
B．result in
C．hold on
D．keep to
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