介绍人物职业与成就的词汇 — 英语词汇题
题目
根据句意及中文提示补全单词，每空填一个完整单词。<br>1. He was the first person to walk on the Moon. He was an a________（宇航员）.<br>2. She created a useful new machine. She was an i________（发明家）.<br>3. He studies plants and animals to learn about the natural world. He is a s________（科学家）.