一种理想的采集精液方法应具备哪四个条件？
参考答案：
1）宽敞、平坦、清洁、安静的采精场；
2）台畜的准备；
3）种公畜的准备；
4）正确掌握采精技术。
用所给单词的反义词完成句子。
1. Look at the palace. It's eight hundred years old. It's very ________. (young)
2. Come and look _________ the window. (outside)
3. Please _________ beside the tree. (stand)
4. Look at the baby, he becomes __________. (loud)
