作者在第一章中提及了几起历史事件。

The author ___refers ___to several historical events in the first chapter.

在他的演讲中，他将公司创始人称为一位有远见的领导者。

In his speech, he ___referred ___to the company's founder as a visionary leader.

这份报告提及了最近关于气候变化的研究。

The report ___refers ___to recent studies on climate change.