词汇扩充+语法训练exercise2
　　Barbara McClintock’s systematic examination of corn demonstrated the transposition of genes, a finding that overturned entrenched beliefs and proved that ------- study may produce brilliant insights and ------- change.
　　A.haphazard . . radical
　　B.inherent . . controversial
　　C.improvised . . startling
　　D.methodical . . revolutionary
　　E.derivative . . gradual
　　Here's Why:
　　Only “methodical study” and “revolutionary change” match the ideas of “systematic examination” and “overturned entrenched beliefs.”