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A．performance
B．capacity
C．action
D．activity
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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.

单项选择题The Grokster decision was based on the evidence that Grokster

A．distributed P2P software illegally.
B．allowed users sharing without permission.
C．violated the copyright of entertainment firms.
D．took advantage of Betamax standard.