单项选择题

A．formal
B．colloquial
C．non-standard
D．standard
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填空题
In many parts of the world, large numbers of trees ______ (遭到砍伐) and the eco logical balance of nature has been disturbed.
单项选择题
A．thereforeB．butC．so thatD．nevertheless
A．therefore
B．but
C．so that
D．nevertheless
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