A:丙细胞的名称是极体或次级精母细胞
B:a和B染色体上的基因可能会发生交叉互换
C:乙细胞中含有同源染色体,处于有丝分裂中期,丙中不含同源染色体
D:丙细胞产生子细胞的过程中会发生等位基因的分离和非等位基因自由组合
年份
2007
2008
2009
2010
2011
2012
2013
年份代号t
1
2
3
4
5
6
7
人均纯收入y
2.9
3.3
3.6
4.4
4.8
5.2
5.9
若y关于t的线性回归方程为 y^ =0.5t+a,则据此该地区2017年农村居民家庭人均纯收入约为( )
My name is Lu Sheng.I'm in Dalian.My favourite colour is white.This is my cat and it's white.What's on my chair? It's a yellow bag.Today is cold,but I still(仍然)swim in the morning.
My name is Carla.I'm in New York.This is my dog and it's brown.It's my favourite colour.What's on the desk? It's a black pen. It's from my good friend Lisa.It's warm this afternoon.Let's play football in my school.
说出句子修辞手法
①这小姑娘就像一朵花,真漂亮!____
②秋天到了,有的树叶变成了黄色,有的树叶变成了红色,还有的半黄半绿,半红半绿别提多好看了!____