单项选择题

This passage concentrates on the issue of the ______ of the terms and concepts by experts discussed in the paper.

A．methods
B．differences
C．similarities
D．disagreements

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单项选择题

What is the main purpose of the passage you have just heard

A．To discuss different concepts.
B．To introduce a new methodology.
C．To talk about conceptual systems.
D．To introduce a research paper.

单项选择题

How old is the housekeeper now

A．Eighteen.
B．Twenty-eight.
C．Thirty-eight.
D．Forty-eight.

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