问题
问答题 简答题
简述杂交育种的步骤？
答案
参考答案：
（1）确定育种目标和育种方案；
（2）杂交；
（3）理想个体的自群繁育与理想性状的固定；
（4）扩群提高
搜题请搜索小程序“爱下问搜题”
简述杂交育种的步骤？
参考答案：
（1）确定育种目标和育种方案；
（2）杂交；
（3）理想个体的自群繁育与理想性状的固定；
（4）扩群提高
| 根据短文内容，用方框中所给词的适当形式填空，使文章通顺、完整。 | |
There was once an old, dying farmer who had worked hard in his vineyard (葡萄园) all his life. Before he died he wanted to teach his three sons how to be good 1. . So he called them and said, "My boys, 2. I die l want you to know that there is a lot of great treasure (财宝) buried in the vineyard. Promise me that you will look for it when I am dead." The sons promised and as soon as their father had died, they 3. looking for the treasure. They worked very hard 4. the hot sun and all the time at they were working they wonder what their father had left for them.In their minds they pictured boxes of gold coins, diamond necklaces and other such things. Soon they had dug up every inch of the vineyard. 5. they found not a single penny. They were very upset. They felt that all their hard work had been 6. . But then the grapes started to 7. on the vines and their grapes were the biggest and 8. in the neighborhood and they sold them for a lot of money. Now they understood what their father had meant by the great treasure, and they lived 9. and wealthily ever after. The moral of this story is: Hard work 10. its reward. |