题目内容

人类基因组包括两个部分DNA,即和

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基因突变主要是DNA一级结构的改变,其分子机制可以是替换、或等

在特定环境信号刺激下,有些基因的表达表现为开放或增强,这种表达方式称为,相反,有些基因的表达表现为关闭或下降,这种表达方式称为

One day, at the registrar’s office of a college, I noticed how parents are behaving with their college-age children nowadays. Obviously students are young_and can handle registration by, but their parents completely_the situation. In a seminar for teaching assistants, I was surprised to hear that parents often go to their office toabout marks and assignments their children have got. What I have seen and heard has left me feeling___. Unlike my parents allowing me to make_in my life, parents of today’s college students seem never to give their children a chance to take____.

-30被7除的余数是

A. 2
B. -2
C. 5
D. -5