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.
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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
单项选择题
Which of the followings is neither expressed nor implied in the passage as being a threat posed by man to wildlife preservation
A．The discharge of chemical wastes into streams as a result of industrial development.
B．Large -scale housing development.
C．Poor coordination of international efforts at park and refuge management.
D．Introduction of species into environments.
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