A:R中的全部脱氧核苷酸酸序列均能编码蛋白质
B:R、S、N中只有部分脱氧核苷酸序列被转录形成mRNA
C:片段M应是基因R或S的非编码区
D:每个基因中有一个碱基对的替换,都会引起生物性状的改变
①无数轻捷柔软的手指,弹奏出一首又一首优雅的小曲。(缩写句子)
②这山中的一切,哪个不是我的朋友?(改为陈述句)
③老桥,你如一位德高望重的老人。(改成感叹句)
④踏上一条幽径,我独自一个人单独去访问我的朋友。(修改病句)
⑤我愿意牵着你的手,一起到草虫的村落里去散散步。(改为反问句)
Hello, boys and girls. My name is Kangkang. I’m from Tianjin. I’m No.1 middle school. My mother works in No.1 middle school. She teaches Chinese. My father is a doctor in a hospital. They both work hard. On Sunday my mother and I often do some shopping. My mother likes shopping a lot. We will go shopping this Sunday afternoon. My mother says she will buy me a red coat. But I don’t like red. I want a yellow one. My mother says yes to me. I am happy. My father doesn’t like shopping at all. He likes animals best. He often takes me to the zoo. My favorite animal is the panda. I think panda are very cute. This Sunday morning my father will go to the zoo with me. I love my parents very much. They love me, too. I have a happy family.