问题
单项选择题
下列结构中染色体是单倍体的是（）。
A.造孢细胞
B.花粉母细胞
C.周缘细胞
D.精子
答案
参考答案：D
搜题请搜索小程序“爱下问搜题”
下列结构中染色体是单倍体的是（）。
A.造孢细胞
B.花粉母细胞
C.周缘细胞
D.精子
参考答案：D
| 从方框中选出合适的选项补全对话，其中有两项是多余选项。 | |
B: Hello, Sally. 1 A: You did very well in the English exam. My English is not very good. B: 2 A: Oh, I know. May I ask you some questions? B: Of course. A: 3 B: I often read good English books and do lots of exercises. A: 4 B: Yes. He comes from America. He often helps me leam English. A: 5 B: Twice a month. A: OK. Thank you very much. B: You are welcome. |