单项选择题

A．4 years
B．5 years
C．8 years
D．at least 9 years
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单项选择题
Low levels of carbon monoxide are not poisonous for healthy individuals.
A．Y
B．N
C．NG
单项选择题
A．Doctor and patient.B．Passenger and bus driver.C．Daughter and mother.D．Customer and merchant.
A．Doctor and patient.
B．Passenger and bus driver.
C．Daughter and mother.
D．Customer and merchant.
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