单项选择题

If you do not know the subject, you will not understand what is said or written, even if English is your mother __

A．speaking
B．language
C．saying
D．tongue
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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
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
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