How would an American introduce two people of the same position to each other in the business world？
A．The older person is first introduced.
B．The female is first introduced.
C．The person more familiar to him is first introduced.
D．The person less familiar to him is first introduced.
请帮忙给出正确答案和分析，谢谢！
如何进行羊的超数排卵？
什么叫做选种？选种有什么意义？
按其组成的纤维类型，羊毛可分为()和()。
补饲的意义是什么？
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