单项选择题

Cowries shells were once in widespread use as a token of value.

A．a symbol
B．an amount
C．a thing
D．an investment
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单项选择题
The environmental balance among ecological communities is exceedingly complex.
A．almost
B．successfully
C．extremely
D．rarely
单项选择题
Both a person's heredity and his environment help to shape his character.
A．relative
B．education
C．nationality
D．surroundings
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