《安全生产法》第五十一条规定：“从业人员有权对本单位安全生产工作中存在的问题提出批评、检举、控告；有权拒绝违章指挥和强令冒险作业”，同时也规定“生产经营单位不得因此而降低其工资、福利等待遇或者解除与其订立的劳动合同”。这一修订（    ）

①体现了我国人民民主的广泛性

②体现了我国人民民主的真实性

③维护了我国公民的民主监督权

④扩大了我国公民的民主管理权

科学家将培育的异源多倍体的抗叶锈病基因转移到普通小麦中，育成了抗叶锈病的小麦，育种过程见图．图中A、B、C、D表示4个不同的染色体组，每组有7条染色体，C染色体组中含携带抗病基因的染色体．请回答下列问题：

（1）异源多倍体是由两种植物AABB与CC远源杂交形成的后代，经____方法培育而成，还可用植物细胞工程中____ 方法（技术）进行培育．

（2）杂交后代①染色体组的组成为____ ，进行减数分裂时形成____ 个四分体，其生殖细胞中含有____ 条染色体．

（3）为使杂交后代③的抗病基因稳定遗传，常用射线照射花粉，使含抗病基因的染色体片段转接到小麦染色体上，这种变异称为____．

按照要求改写句子。

根据短文理解，完成下列各题。

   My mother was telling me about how she and her family got their first television when she was a teenager. Of course, it was black and white. She said she only watched it at night. When I was young, we had only about 3 or 4 different channels. My brothers, my sisters and I would sometimes fight about which channel to watch. But we usually enjoyed the same shows.

   Nowadays, we can get hundreds of channels on TV. There are channels with old movies, cooking, fishing and so on. It's amazing! I wonder how much my brothers, my sisters and I would fight if we had hundreds of channels when I was a child. Of course, we had only one television set. These days I notice families with 2 or 3 or more television sets in their homes. I guess it stops people from arguing over which channel to choose.