简述羊毛形态学构造。

剩余价值产生的唯一源泉是()

A．必要劳动

B．社会劳动

C．剩余劳动

D．复杂劳动

请帮忙给出正确答案和分析，谢谢！

绵羊剪毛方法主要分为()和()两种。

对于奶羊，在产奶量上升停止后，应将超标准的促奶饲料减去，但应避免饲料和饲养方法的突然变化，以争取有一个较长的稳产期。()

Whats the reason for Andersons sarcastic humor？

A．He envied the writer for having published a novel.

B．He had had a volume of poetry rejected by a publisher.

C．He had not been able to fulfill his early ambitions.

D．He was bored when there was not enough news to fill the paper.

请帮忙给出正确答案和分析，谢谢！

下列哪种奶中含的矿物质最高？()

A、人奶

B、牛奶

C、羊奶

D、马奶