嵌套枚举列表，分页符

Question

我目前正在写一份多项选择题考试：问题编号有一个枚举列表，每个多项选择题中选项有一个嵌套列表：
1. 问题 1
a)
b)
c)
d)
2. 问题 2
a)
b)
c)
d) ...
如果问题列表很长，则某个问题的选项通常会在各个页面之间分离。解决此问题最直接的方法就是在出现分离的地方写下来\newpage。我想知道有没有更好的方法？是否可以更改（或创建一个新的）环境，使选项始终分组，这样它们就不会在各个页面之间分离？

Answer 1

一个选择是将列表包装在minipage(minipage不允许分页符) 中：

\documentclass{exam}

\begin{document}

\noindent\begin{minipage}{\linewidth}
\begin{questions}
\question
One of these things is not like the others; one of these things is not
the same. Which one is different?
\begin{choices}
\choice John
\choice Paul
\choice George
\choice Ringo
\choice Socrates
\end{choices}
\end{questions}
\end{minipage}

\end{document}

当然，你可以定义一个新的环境来减轻工作量：

\documentclass{exam}

\newenvironment{nbchoices}[1]
  {\par\noindent\begin{minipage}{\linewidth}\begin{questions}\question#1\begin{choices}}
  {\end{choices}\end{questions}\end{minipage}\par}

\begin{document}

\begin{nbchoices}{One of these things is not like the others; one of these things is not
the same. Which one is different?}
\choice John
\choice Paul
\choice George
\choice Ringo
\choice Socrates
\end{nbchoices}

\end{document}

使用article标准enumerate环境，同样的想法适用：

\documentclass{article}

\newenvironment{nbchoices}[1]
  {\item#1\par\begin{minipage}{\linewidth}\begin{enumerate}}
  {\end{enumerate}\end{minipage}\par}

\begin{document}

\begin{enumerate}
\begin{nbchoices}{One of these things is not like the others; one of these things is not
the same. Which one is different?}
\item John
\item Paul
\item George
\item Ringo
\item Socrates
\end{nbchoices}
\begin{nbchoices}{One of these things is not like the others; one of these things is not
the same. Which one is different?}
\item John
\item Paul
\item George
\item Ringo
\item Socrates
\end{nbchoices}
\end{enumerate}

\end{document}

选择之间不会出现分页符。