单项选择题

The concept of business model first appeared in ( )

A．1850s
B．1950s
C．1750s
D．The end of the 19th century

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对于特定的活化能，反应速率提高1倍，温度越低,所需提高的温度越【填空1】。

答案： 1、小

单项选择题

In western culture, there has always been a conflict between anthropocentrism and ecocentrism. The latter is a human centered system while the former is nature-centered.
A、正确
B、错误