<strong class="em ">世界史一問一答（解説付き）：<a href="https://apps.apple.com/jp/app/%E4%B8%96%E7%95%8C%E5%8F%B2%E4%B8%80%E5%95%8F%E4%B8%80%E7%AD%94-%E8%A7%A3%E8%AA%AC%E4%BB%98%E3%81%8D/id1168884334">iOS</a> / <a href="https://play.google.com/store/apps/details?id=jp.co.gakkonet.trainingsekaishihs&hl=ja">Android</a></strong>

世界史一問一答（解説付き）：iOS / Android