猪、牛、羊一般处于发情周期的第几天后，卵巢黄体对PGF2a产生反_爱下问搜题

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问题问答题简答题

猪、牛、羊一般处于发情周期的第几天后，卵巢黄体对PGF2a产生反应？

答案

参考答案：

牛、羊排卵后4d黄体即可被溶解，猪只有在排卵后10~20d才被溶解。

名词解释

低温疗法

完形填空

完形填空（共20小题：每小题1.5分，满分30分）
阅读下面短文，从短文后各题所给的四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
On receiving my learner driver license a couple of months ago, I started driving lessons straight away. In New Zealand, the __1__ driving age is 15.
However it wasn’t __2__ two days ago that Dad finally allowed me to drive on the motorway. Our __3__ was Urawa, a seaside town about 60 kilometers away from my home in Auckland. That morning I __4_ sure I had enough to drink and went to the toilet (厕所) about three times __5_ we left. I thought I was totally __6 for the journey, but nothing could have prepared me for my family’s _7__. "Relax! Don’t hold the steering wheel (方向盘) so _8_. The car is going zigzag (弯弯曲曲的), called a nervous voice from the __9__. "Speed up. 70km/h isn’t fast enough. You are holding up the traffic," another voice ordered from the seat next to mine.
How _10__ ! My parents were really starting to get on my nerves. To satisfy them I sped up and within a second, an angry voice began to yell again. "Stop! __11__! Are you crazy? ” Everything did not go fine until I pulled off the motorway and drove into the city, 12__ the speed limit was only 50km/h.
My family seemed relieved (放心的) and __13__ telling me what to do. They all looked out of the windows and enjoyed the scenery. 14__, that silence didn’t last very long. My mum suddenly cried out, "Look at those birds above us. __15 they lovely?"
How did she expect me to look up in the __16__? As the driver I had to _17_ . Who knows what would have happened if I had taken my eyes off the 18__? Four hours later we drove home. This time the journey was much __19__ than before as everyone else __20__ fast asleep. So, I just took my time and enjoyed the drive.

A．destination

A．disappointed

B．encouragements

A．interesting

小题14: A. Luckily B. Probably C, Warmly D. Sadly

B．concentrate