摄食羊肉可以减少心血管系统疾病的危害的根据是()。
A.羊肉含胆固醇少
B.羊肉蛋白质含量高
C.羊肉的氨基酸种类齐全
D.羊肉肉质鲜美
试述如何提高绵羊人工授精的受胎率？
毛干(名词解释)
内蒙古细毛羊是以苏联美利奴羊，高加索羊，新疆细毛羊和德国美利奴羊与当地蒙古羊母羊，采用育成杂交方法育成。()
What did the Dodds do when they went away last summer？
A．They hired someone to stay in their home.
B．They left their pets with neighbors.
C．They rented their house to a student.
D．They asked their gardener to watch their house.
请帮忙给出正确答案和分析，谢谢！
羊性成熟(名词解释)
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