带有自定义前缀的枚举

Question 1

鉴于有可用于排版示例、问题和答案等的软件包，不清楚自己做这件事是否有意义。不过，如果你想自己动手，我会尝试以下方法。

我放弃了enumerate。用加载它是没有意义的enumitem，特别是如果你要求后者用来模拟前者shortlabels。

根据您的问题我假设您想要：

左边距无缩进；
无论级别如何，列表中的项目之间没有额外的垂直间距。

由于这并非完全简单，如果您不是故意的，您应该更清楚您的愿望。

我尽力从您的问题和代码中了解您的需求，我使用了一个questions用定义的3 级列表enumitem。在列表中\qn创建一个问题并\ans创建一个答案。

因此，

\begin{questions}
  \qn How many countries are there in the world?
  \ans There are 196 countries in the world today. Unless you don't count Taiwan…
  \begin{questions}
    \qn How many countries are there in Europe?
    \ans Approximately 50 countries.
    \qn How many countries are there in Asia?
    \ans 48.
  \end{questions}
  \qn What is the population of the world?
  \ans Around 7.4 billion people
  \begin{questions}
    \qn What is the population of the US?
    \ans 324,532,828 as of Sunday, September 4, 2016.
    \begin{questions}
      \qn What is the population of Nevada state?
      \ans Around 2,943,409.
    \end{questions}
  \end{questions}
\end{questions}

生产

代码：

\documentclass{article}
\usepackage{enumitem}
\makeatletter
\newlist{questions}{enumerate}{3}
\setlist[questions]{itemindent=0pt, labelwidth=!,align=parleft,itemsep=\lineskip,parsep=\lineskip}
\setlist[questions,1]{label=Q\,\arabic*,leftmargin=1.5\parindent,labelindent=0pt,ref=\arabic*}
\setlist[questions,2]{label=Q\,\arabic{questionsi}.\arabic*,leftmargin=.5\parindent,labelindent=-1.5\parindent,ref=\arabic{questionsi}.\arabic*,topsep=\lineskip,partopsep=\lineskip}
\setlist[questions,3]{label=Q\,\arabic{questionsi}.\arabic{questionsii}.\arabic*,leftmargin=.5\parindent,labelindent=-2\parindent,ref=\arabic{questionsi}.\arabic{questionsii}.\arabic*,topsep=\lineskip,partopsep=\lineskip}
\newcommand*\qn{\stepcounter{cntquestions}\item\label{qn:\thecntquestions}}
\newcommand*\ans{\item[A\,\ref{qn:\thecntquestions}]}
\newcounter{cntquestions}
\setcounter{cntquestions}{0}
\makeatother
\begin{document}
\begin{questions}
  \qn How many countries are there in the world?
  \ans There are 196 countries in the world today. Unless you don't count Taiwan…
  \begin{questions}
    \qn How many countries are there in Europe?
    \ans Approximately 50 countries.
    \qn How many countries are there in Asia?
    \ans 48.
  \end{questions}
  \qn What is the population of the world?
  \ans Around 7.4 billion people
  \begin{questions}
    \qn What is the population of the US?
    \ans 324,532,828 as of Sunday, September 4, 2016.
    \begin{questions}
      \qn What is the population of Nevada state?
      \ans Around 2,943,409.
    \end{questions}
  \end{questions}
\end{questions}
\end{document}

Answer

鉴于有可用于排版示例、问题和答案等的软件包，不清楚自己做这件事是否有意义。不过，如果你想自己动手，我会尝试以下方法。