题目内容

-Would you like milk and sugar?-___________________________

A. No, but I’d like some water.
B. Just milk, please.
C. Don’t worry.

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-What about you, Mr. Rogers?-___________________________

A. No, but I’d like some water.
B. I am sorry you have to wait.
C. Please call me Paul.

-Could we sit by the window?-___________________________

A. I am afraid those seats are reserved.
B. Yes, our dinner is ready.
C. The windows are broken.

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什么是上限截止频率？什么是下限截止频率？