题目

下图为某二倍体生物精原细胞分裂过程中，细胞内的同源染色体对数的变化曲线。下列说法错误的是：   A、染色体数目最多的时期在CD段 B、只有AB段和EG段细胞内可能含有2个染色体组 C、基因重组最可能发生在FG段 D、此图中既有精原细胞的有丝分裂也有减数分裂 答案：B听下面一段较长对话，回答以下小题。1.What’s Anna doing?A. Doing the housework. B. Listening to music. C. Doing her homework.2.Who is playing computer games?A. Anna’s brother. B. Anna’s mother. C. Anna’s father.3.What is Anna’s grandmother doing?A. Reading a newspaper. B. Watching TV. C. Talking to Anna’s mother.4.Where is Anna’s father?A. In the dining room. B. In the living room. C. In the garden.