外刊精读：Shampoo – do we really need to use it 我们真的需要用洗发水吗？学案-2024届高三英语一轮复习

2024届高考备考 外刊精读 Day 24 Shampoo – do we really need to use it 我们真的需要用洗发水吗？ 学案 文本导读： 如今，市面上有多种多样的洗发水可供选择，有许多都声称能改善发质。但洗发水真能做到这一点吗？本文讨论洗发产品的原理，以及使用特定类型的洗发水对改善发质是否真的有用。 Step 1:词汇温习 brand 品牌 repair 修复 nourish 滋养 strengthen 使强韧，强化 volume 数量 oil-like substance 类似油类物质 shiny 有光泽的 aesthetic 美观的 chemical 化学品 surfactant 表面活性剂 surface 表层 harsh 刺激性强的 conditioner 护发素 styling product 美发定型产品 texture （发）质，质地 cleanse 清洁，清洗 miracle cure 灵丹妙药 Step 2: 原文精听+精读 Buying shampoo can be overwhelming – there are so many brands to choose from, across a huge range of prices. Some brands promise to repair and nourish our hair, while others promise to strengthen and add volume. But are any of these claims true? Do we even need shampoo at all? Since long before shampoo was invented – some say in India – our bodies have been producing sebum – an oil-like substance. Sebum stops our skin from getting dry, manages the health of our scalp and makes our hair shiny. But it also collects dirt, and, if left untouched for too long, sebum can cause our hair to become greasy. There are no disadvantages from a health perspective to letting our hair be greasy, says Eleanore Richardson, Trichologist at Fulham Scalp and Hair Clinic, but many people choose to wash their hair regularly for aesthetic reasons. And so we reach for the shampoo bottle. Shampoos contain a group of chemicals called surfactants. They grab the dirt and grease from the surface of our hair, meaning when we rinse away the shampoo, we also wash away the grease and dirt. But, as Laura Waters, who's a Professor of Pharmaceutical Analysis in the School of Applied Sciences at Huddersfield University, points out, 'some surfactants work too well' and take the natural oils out of the hair, as well. More expensive shampoos may contain less harsh surfactants, but – adds Laura Waters – the type of shampoo doesn't really matter. 'It's on our hair very briefly and gets washed away'. It's the conditioners and styling products that we use after the shampoo t