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【单选题】
以下关于函数的叙述中不正确的是（）A.
在 C 语言，被调用的函数必须在 main 函数中定义
B.
C 程序是函数的集合，包括标准库函数和用户自定义函数
C.
在 C 语言，函数的定义不能嵌套
D.
在 C 语言，函数的调用可以嵌套
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【单选题】听力原文：W: Professor Smith said that I could find the book relevant to my major on the shelves in this section. But I could not even figure out anything similar. M: Maybe the book has been borrowed from ...
A.
At the library.
B.
At the airport.
C.
At the post office.
D.
At the teacher's office.
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