单项选择题
猪副伤寒的病原微生物是()
A.大肠杆菌
B.沙门氏菌
C.巴氏杆菌
D.炭疽
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单项选择题
We cannot judge a person simply on the ()of his education.
A.condition
B.basis
C.principle
D.theory
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单项选择题
DNA分子中1个或多个碱基消失称为()
A、转换
B、颠换
C、缺失
D、插入
E、重排
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