\documentclass{elsarticle}
\usepackage{lipsum}
\begin{document}
\begin{frontmatter}
\title{This is the title}
\author[add1]{Author1}
\ead{[email protected]}
\address[add1]{Department of Institute1}
\author[add2]{Author1}
\ead{[email protected]}
\address[add2]{Department of Institute2}
\begin{abstract}
Happiness is a mental or emotional state of well-being defined by positive or pleasant emotions ranging from contentment to intense joy.[1] Happy mental states may also reflect judgements by a person about their overall well-being.[2] A variety of biological, psychological, economic, religious and philosophical approaches have striven to define happiness and identify its sources. Various research groups, including positive psychology and happiness economics are employing the scientific method to research questions about what "happiness" is, and how it might be attained.
\end{abstract}
\begin{keyword}
\textbf{Index Terms:}
\end{keyword}
\end{frontmatter}
\twocolumn
\section{The Elsevier article class}
Happiness is a mental or emotional state of well-being defined by positive or pleasant emotions ranging from contentment to intense joy.[1] Happy mental states may also reflect judgements by a person about their overall well-being.[2] A variety of biological, psychological, economic, religious and philosophical approaches have striven to define happiness and identify its sources. Various research groups, including positive psychology and happiness economics are employing the scientific method to research questions about what "happiness" is, and how it might be attained.
Happiness is a mental or emotional state of well-being defined by positive or pleasant emotions ranging from contentment to intense joy.[1] Happy mental states may also reflect judgements by a person about their overall well-being.[2] A variety of biological, psychological, economic, religious and philosophical approaches have striven to define happiness and identify its sources. Various research groups, including positive psychology and happiness economics are employing the scientific method to research questions about what "happiness" is, and how it might be attained.
Happiness is a mental or emotional state of well-being defined by positive or pleasant emotions ranging from contentment to intense joy.[1] Happy mental states may also reflect judgements by a person about their overall well-being.[2] A variety of biological, psychological, economic, religious and philosophical approaches have striven to define happiness and identify its sources. Various research groups, including positive psychology and happiness economics are employing the scientific method to research questions about what "happiness" is, and how it might be attained.
\end{document}
大家好，我希望使用单列格式（全宽文本）来编写标题、作者、摘要和关键词，而文档的其余部分则采用 2 列格式。但是，文档在关键词后遇到分页符。以下是一个最小的工作示例。非常感谢您的帮助 :)
答案1
首先，删除指令\twocolumn。然后，提供单个 documentclass 选项5p或一对 document class 选项3p和twocolumn。即，写入
\documentclass[3p,twocolumn]{elsarticle}
或者
\documentclass[5p]{elsarticle}
（该选项默认5p使用。）twocolumn
哪种方法更好？我不知道。这取决于特定的期刊及其格式要求。