单项选择题

A linguist regards the changes in language and language use as ______.

A．unnatural
B．something to be feared
C．natural
D．abnormal
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单项选择题
Which American president witnessed the disintegration of the Soviet Union and the Westernization ofEast European countries
A．Carter.
B．Reagan.
C．Bush.
D．Clinton.
单项选择题
It can be inferred from the passage that studies of endangered species ______.
A．have revealed little of importance to improve wildlife preservation
B．are more likely to be carded out when a financially concerned interest group is involved
C．sometimes endanger the very species they hope to protect
D．show that endangered species can never be saved except at great cost
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