单项选择题

linguists give priority to the spoken language not the written language because ______.

A．vocal sounds are derived from writing systems
B．speech precedes writing everywhere in the world
C．we have recording devices to study speech
D．spoken language precedes written language only in Indo - European languages
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单项选择题
Which of the followings is neither expressed nor implied in the passage as being a threat posed by mall 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.
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 carried 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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