某小论文的内容,主要是“宣扬人道的社会主义、放弃一党制、实施社会经济发展战略”。可见,该文的主题是( )
A:新经济政策的推行
B:斯大林模式的形成
C:赫鲁晓夫上台执政
D:戈尔巴乔夫的改革
豌豆灰种皮(G)对白种皮(g)为显性,黄子叶(Y)对绿子叶(y)为显性。每对性状的杂合体(F1)自交后代(F2)均表现3:1的性状分离比。以上种皮颜色的分离比和子叶颜色的分离比分别来自对以下哪代植株群体所结种子的统计( )
①汽车尾气
②煤燃烧产生的烟尘和气体
③动物呼出的气体
④化工厂排放的废气
⑤植物光合作用产生的气体
⑥沙尘暴.
Nice to meet you. My name is Sally Simpson. Sally is my first name. Simpson is my last name. I'm in Huangzhou, China now. I'm a student in HZFL Middle School. My classroom is very nice. My telephone number is 832—4895.
Good morning! I'm Wu Lei. My first name is Lei and my last name is Wu. I'm in Macheng now. I'm a student in HY Middle School. My phone number is 291—5638. And my QQ number is 83250194.
Hi! My name is Dong Huixia. I'm an English teacher in JM Middle School, Huangmei. I like (喜欢) my students. I'm their good friend. My telephone number is 338—0479.
Hello! My name is Mike Brown. I'm in Wuxue, China now. I'm a student in SY Middle School. My telephone number is 625—1899. And my QQ number is 389410663. My parents are in the school, too.
—That's true. I was too busy, so I didn't go, ______.
—Who helped you with your English?
—_______! I learned it all by myself.