单项选择题

A．Professors.
B．Reporters.
C．Students.
D．Policemen.
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单项选择题
A．Painting.B．Washing.C．Repairing.D．Petrol filling.
A．Painting.
B．Washing.
C．Repairing.
D．Petrol filling.
单项选择题
Most toxicology tests for cosmetics are often poorly predictive animal experiments.
A．Y
B．N
C．NG
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