自顶向下设计，每层设计中，参数和返回值如何设计是重点，其他细节可以暂时忽略。
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pyinstaller是-一个十分有用的第三方库，它能够在Windows、Linux、 Mac OS x等操作系统下将Python源文件打包，通过对源文件打包。
A. 对
B. 错
Tuesday is the _______ day of a week in English.
A. first
B. second
C. third
D. Fourth
The students went out of the room___.
A. one by two
B. one by one
C. two by another
D. one by the other
I've been a student there for nearly two and _______ half years.
A. a
B. an
C. the
D. /
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