單一清單中的不同項目符號

Question

我想要這個枚舉清單包含以下內容：

1. 僅問題標示 (a)、(b)、(c)。答案根本不該被標記。

2. 這六行應該一一出現。首先，僅顯示第一個問題，然後按下一頁後顯示其答案。然後是第二個問題，然後是第二個答案，...

   \documentclass[]{beamer}
   
   \begin{document}
   
   \begin{frame}
   \frametitle{Example}
   \begin{enumerate}[(a)]
   \item<1-> Q: what is the answer to the first question?
   \item<2-> A: The answer is A.
   \item<3-> Q: what is the answer to the second question?
   \item<4-> A: The answer is B.
   \item<5-> Q: what is the answer to the second question?
   \item<6-> A: The answer is C.
   \end{enumerate}
   \end{frame}
   
   \end{document}
   

Answer 1

一種可能性是建立自訂空item命令：

\documentclass[]{beamer}

\newcommand{\answer}{\item[]} %new code
\begin{document} 

\begin{frame}
\frametitle{Example}
 \begin{enumerate}[<+->][(a)]    %new code          
  \item Q: what is the answer to the first question?
  \answer A: The answer is A.
  \item Q: what is the answer to the second question?
  \answer A: The answer is B.
  \item Q: what is the answer to the second question?
  \answer A: The answer is C.
\end{enumerate}
\end{frame}

\end{document}

我還刪除了單獨的覆蓋規範並添加了一個+-影響整個列表的運算符。

---

正如 @moewe 的評論中所指出的，透過將重複使用元素添加到自訂項定義中可以使程式碼更加緊湊：

\documentclass[]{beamer}

\newcommand{\answer}[1]{\item[] A: The answer is #1.}  %new code
\newcommand{\question}{\item Q:}   %new code
\begin{document}

\begin{frame}
\frametitle{Example}
 \begin{enumerate}[<+->][(a)]               
  \question what is the answer to the first question?
  \answer{A}
  \question what is the answer to the second question?
  \answer{B}
  \question what is the answer to the second question?
  \answer{C}
\end{enumerate}
\end{frame}

\end{document}

結果和以前一樣。我不會對「…的答案是什麼」部分做同樣的事情，因為我懷疑這些部分只是為了 MWE

Answer 2

只需用於[]指定空項目標籤。當然，您也可以為此類項目定義自己的巨集。

\documentclass[]{beamer}

\begin{document}

\begin{frame}
\frametitle{Example}
 \begin{enumerate}[(a)]
  \item<1-> Q: what is the answer to the first question?
  \item[]<2-> A: The answer is A.
  \item<3-> Q: what is the answer to the second question?
  \item[]<4-> A: The answer is B.
  \item<5-> Q: what is the answer to the second question?
  \item[]<6-> A: The answer is C.
\end{enumerate}
\end{frame}

\end{document}