单项选择题

A．Broad codes to maximize human benefits.
B．Strict supervision of all scientific research.
C．The indifference of public attitudes toward ethical and human values.
D．The maintenance of chemistry as a pure science.
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单项选择题
A．Turn right.B．Turn left.C．Drive two blocks to the next stoplight.D．Make a U - turn at the second stoplight.
A．Turn right.
B．Turn left.
C．Drive two blocks to the next stoplight.
D．Make a U - turn at the second stoplight.
单项选择题
A．Make sure there is no misunderstanding.B．Try to persuade by giving various reasons.C．Repeat the same reasonsD．Listen carefully and patiently to the other party
A．Make sure there is no misunderstanding.
B．Try to persuade by giving various reasons.
C．Repeat the same reasons
D．Listen carefully and patiently to the other party
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