单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．Three quarters of an hour.
B．A quarter of an hour.
C．Ten minutes.
D．Half an hour.
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单项选择题
According to the passage, prediction markets can be more effective when ______.
A．firms can offer the most successful traders bigger prizes
B．the application of prediction results can be felt by employees
C．firms can keep the prediction as a novelty to staff
D．prediction is made by authoritative experts in certain field
单项选择题
With the experiment going on, the two researchers find that ______.
A．student participants hurt less and less after suffering the unintentional shocks
B．student participants hurt more and more after suffering the unintentional shocks
C．student participants hurt more and more after suffering the Perceived deliberate shocks
D．student participants hurt less and less after suffering the perceived deliberate shocks
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