问答题

Perhaps it came into existence with the great increase in population and the development

【参考答案】

也许它是伴随着人口的急剧增长和发展而产生的。

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单项选择题

A．should test only opinions
B．should always be written
C．has changed since the Middle Ages
D．is given only in factories

问答题

Butifallofthemhadworkedseparatelyandindependentlywithoutdivisionoflabor,theycertainlycouldnothavemadetwentypinsinadayandnotevenone.