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单项选择题

​Which of the following IS LEAST possibly the purpose of making a presentation?‍

A．To show off the speaker’s competency to the audience
B．To train the audience
C．To persuade the audience in order to sell some certain products
D．To inform the audience of a fact

问答题

如果一个函数可以看做某个可变换函数所组成的序列的极限，对序列中每一函数进行变换，组成一个新的变换式序列，这个新序列的极限就是原来函数的___。