单项选择题
A.1907B.1910C.1912D.1920
A.1857B.1987C.1988D.1989
A.Watson和ChaseB.Nirenberg和KhoranaC.Hershey和AveryD.Watson和Crick
A.家蝇B.小白鼠C.果蝇D.壁虎
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