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
In 1984, President Ronald Reagan proposed that the United States construct a launch laboratory for a new era of space exploration.
A．probing
B．revenge
C．invasion
D．expansion
单项选择题
No other newspaper columnist has managed as yet to of readership.
A．though
B．in spite of this
C．even
D．so far
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