If this active gene is a mutation that would otherwise have been recessive
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单选题If this active gene is a mutation that would otherwise have been recessive, it can lead to disease.Conversely, if the silenced gene is harmful in some way, imprinting can be beneficial.
A.Confusingly
B.Contrarily
C.Comparatively
D.Conceivably
参考答案：B
答案解析：词义辨析。观察两个条件之间的逻辑关系，先从“active gene”和“silenced gene”看出前后是相反相对的关系，再由“beneficial”和“lead to disease”的语义相悖确定判断，因此替换部分应为“完全相反地，相对地”，B答案最符合。
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