简述影响畜禽肥育效率的因素。
参考答案：
1.畜禽种类与品种类型。
2.性别与去势。
3.饲养水平。
4.饲粮能量浓度。
5.坏境温度。
(1)滑块A在斜面上滑下时的高度h；(2)滑块A最终与D点间的距离．
I was surprised by her words, which made me recognize ________ silly mistakes I had made. [ ]
A. what
B. that
C. how
D. which
