问题
选择题
在人体内只含性染色体，而不含常染色体的细胞是[ ]
A．精子
B．卵细胞
C．受精卵
D．不存在
答案
答案：D
搜题请搜索小程序“爱下问搜题”
在人体内只含性染色体，而不含常染色体的细胞是[ ]
A．精子
B．卵细胞
C．受精卵
D．不存在
答案：D
| 根据对话内容及方框中所给的句子补全对话，选项中有两项是多余选项。 A: Are you free now, Bill? B: Yes. What's up? A: 1 B: Sure! A: You are good at English. 2 B: I just try to speak English often every day. I often talk with my family and friends in English. A: Can your family and friends speak English? B: Yes, a little, some simple words. A: 3 B: Of course. I have joined an English club. I often practice conversations with many English-speaking friends there. A: Wonderful! By the way, do you have an English pen pal? B: Yes. I have an American pen pal. 4 This helps improve my writing skills. A: Wow! You have many ways to practice English. 5 B: OK. I will try my best to help you. | |
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