单项选择题

A．average
B．percentage
C．amount
D．proportion
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单项选择题
A．performanceB．capacityC．actionD．activity
A．performance
B．capacity
C．action
D．activity
单项选择题
The ruling of America's Supreme Court
A．indeed hit the piracy industry hard.
B．has little impact on content sharing.
C．may prevent tech firms from innovating.
D．can lead to a flourish of entertainment industry.
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