单项选择题

A．Study the case carefully beforehand.
B．Stick to a set target.
C．Appear friendly to the other party.
D．Try to be flexible about their terms.
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单项选择题
A．Availability of artificial body organs.B．Elimination of genetic defects.C．Improvements in drags for medical use.D．An explanation of the origin of life.
A．Availability of artificial body organs.
B．Elimination of genetic defects.
C．Improvements in drags for medical use.
D．An explanation of the origin of life.
单项选择题
A．A head cold.B．The weather.C．The woman’ s son.D．Fatigue.
A．A head cold.
B．The weather.
C．The woman’ s son.
D．Fatigue.
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