单项选择题

When does school begin

A．At 7:30.
B．At 7:00.
C．At 6:45.
D．At 7:15.
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单项选择题
How many animal diseases are mentioned in the interview
A．Two.
B．Three.
C．Four.
D．Five.
单项选择题
What is the substance in cigarettes that causes cancer
A．Nicotine.
B．Not mentioned here.
C．Tar.
D．Cigarette ashes.
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