单项选择题

Two substitutes were used during the critical basketball game last night.

A．players
B．replacements
C．centers
D．referees
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单项选择题
For all its extremes, Venus is a(n) incalculable laboratory for researchers studying the weather and climate of earth.
A．invaluable
B．valuable
C．value
D．valueless
单项选择题
Is there any occasion for my appearance before the court
A．objection
B．cause
C．doubt
D．question
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