单项选择题

The constant friction of the wire on the metal pulley eventually caused it to break.()

A. declining
B. ageing
C. pulling
D. rubbing

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There is always excitement at the Olympic Games when an athlete breaks a previous record of performance.
A．beats
B．destroys
C．maintains
D．defends
单项选择题
She has been the subject of massive media coverage.()

A. extensive
B. negative
C. expensive
D. active
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