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单项选择题
What is not of the most controversial topics in grand prix racing
A．Security.
B．Engine.
C．The "tyre war".
D．Deaths and accidents.
单项选择题
When will the first set of workshop session begin
A．At 10:00 AM.
B．At 8:00 AM.
C．At 10:30 AM.
D．At 8:30 PM.
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