单项选择题
下列突变中,哪一种致死性最大?( )A、胞嘧啶取代腺嘌呤B、腺嘌呤取代鸟嘌呤C、插入三个核苷酸D、插入一个核苷酸E、丢失三个核苷酸
下列突变中,哪一种致死性最大?( )A、胞嘧啶取代腺嘌呤B、腺嘌呤取代鸟嘌呤C、插入三个核苷酸D、插入一个核苷酸E、丢失三个核苷酸
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单项选择题
Nova Scotia's spectacular shorelines and charming villages_____ thousands of tourists from around the world.( )
Nova Scotia's spectacular shorelines and charming villages_____ thousands of tourists from around the world.( )
A.esteem
B.delight
C.lure
D.shun