末尾单引号和双引号不显示

Question

我正在学习 Toni Farley 的课程“Latex for professional publication”，但单引号和双引号显示不正确。以下代码

\documentclass{article}
\begin{document}
\noindent  `single´  quotes, and ``double´´ quotes
\end{document}

排版时产生以下输出：

Answer 1

我添加了几个例子。

\documentclass[a4paper]{article}
\usepackage[english]{babel}
\usepackage[utf8x]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{textcomp}
\begin{document}
\noindent  \textquotesingle single\textquotesingle\  quotes, and \textquotedbl double\textquotedbl \ or \textquotedblleft another double\textquotedblright\ quotes, or "another"
\end{document}