【单选题】真核生物DNA水平上的基因表达调控不包括()。
【单选题】学生休学以一学年为期。经学校批准,在最长学习年限内,休学次数累计不超过( )次,休学时间累计不超过( )学年。学年中办理休学者,该学年按休学计算。
【单选题】关于检验仪器, 不正确 的是 ( ) 。
【单选题】Which of the following is most clearly ogous to the example in the passage of the person who fears dogs?
A.
A child chokes on a fishbone and as an adolescent is reluctant to eat fish.
B.
A person feels lonely and after a while buys a dog for companionship.
C.
A child studies science in school and later grows up to become a teacher.
D.
A person hears that a snowstorm is predicted and that evening is afraid to drive home.