问题
名词解释
顶交与底交
答案
参考答案:
近交系的公畜与非近交系的母畜交配叫顶交;相反,非近交系的公畜与近交系的母畜交配叫底交。
顶交与底交
参考答案:
近交系的公畜与非近交系的母畜交配叫顶交;相反,非近交系的公畜与近交系的母畜交配叫底交。
从方框中选择适当的句子补全对话,有两项多余。(5分) A: Good morning. B: 小题1: A: Do you have a friend here? B: Yes, I do. A: 小题2: B: Oh. She is my friend, Amy. A: 小题3: B: She comes from the USA. A: She looks like Judy. B: 小题4: A: Are they in the same grade? B: Yes. 小题5: A: Is Judy your friend, too? B: No, she isn’t.
|