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
Some nervous tension is good for you to ______.
A．have a deeper sleep before the speech
B．think quickly and keep active
C．make muscles completely relaxed
D．make a dull or listless speech
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