简述养羊业在国民经济中的地位与作用。

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• 1人类的祖先是什么?要有科学依据哦!
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• 2What is one of the responsibilities of the house-sitter according to the conversation？A．Wa

  What is one of the responsibilities of the house-sitter according to the conversation？

  A．Walking the dog.

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  C．Taking care of the children.

  D．Paying the water and electricity bill.

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• 3近代日本学习什么科学技术
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• 4仪器检验法是根据食品中待测组分的（)，利用仪器来测定其含量的方法。A.感官形貌性质B.生物生理特性

  仪器检验法是根据食品中待测组分的()，利用仪器来测定其含量的方法。

  A.感官形貌性质

  B.生物生理特性

  C.溶解、凝聚性能

  D.物理、化学性质

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• 5设集合A={a,b},B={-1,0,1},则集合A到集合B的映射共有几个?请将它们分别写出来,可是
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• 6What can be inferred about the man from the conversation？A．He always registers early.B．He

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  A．He always registers early.

  B．He usually registers at the last minute.

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• 7如果集合A=(a,b)B=(0,1),那么从A到B的映射有几个
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• 8Why is the woman at the registrars office？A．She works part－time there.B．She goes to apply

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• 9集合A中含有2个元素，集合A到集合A可构成
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• 10简述羊的同期发情技术。

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