单项选择题

At what temperature does the superconducting ceramic lose its resistance

A．-143 degree Celsius.
B．-263 degree Celsius.
C．As long as it is ice-cold.
D．Absolute zero.
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The weather was nice in Trumbull County on Saturday evening.
A． Right
B． Wrong
C． Not mentioned
单项选择题
Which of the following is NOT true of traditional university research
A．It is free.
B．It is profit-driven.
C．It is widely available.
D．It is curiosity-driven.
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