单项选择题

A．Three.
B．Four.
C．Five.
D．Six.
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单项选择题
A．After he left St. Mary’s Hospital, Fleming joined his brother in his practice.B．In 1928, Fleming produced pure penicillin in quantity.C．Fleming began his medical training at the age of twenty.D．Fleming got the Nobel Prize for medicine in 1954.
A．After he left St. Mary’s Hospital, Fleming joined his brother in his practice.
B．In 1928, Fleming produced pure penicillin in quantity.
C．Fleming began his medical training at the age of twenty.
D．Fleming got the Nobel Prize for medicine in 1954.
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