第二部分 专题3 阅读理解 题型类(三)-【金版教程】2023高考英语大二轮刷题首选卷课件PPT（老教材，全国统考版）

专题三　阅读理解 1 题型类(三)　主旨大意题 2 A (2022·新高考Ⅰ卷)Human speech contains more than 2，000 different sounds, from the common “m” and “a” to the rare clicks of some southern African languages.But why are certain sounds more common than others? A ground－breaking, five－year study shows that diet－related changes in human bite led to new speech sounds that are now found in half the world's languages. More than 30 years ago, the scholar Charles Hockett noted that speech sounds called labiodentals, such as “f” and “v”， were more common in the languages of societies that ate softer foods. Now a team of researchers led by Damián Blasi at the University of Zurich, Switzerland, has found how and why this trend arose. 题型类（三） They discovered that the upper and lower front teeth of ancient human adults were aligned (对齐), making it hard to produce labiodentals, which are formed by touching the lower lip to the upper teeth. Later, our jaws changed to an overbite structure (结构), making it easier to produce such sounds. The team showed that this change in bite was connected with the development of agriculture in the Neolithic period. Food became easier to chew at this point. The jawbone didn't have to do as much work and so didn't grow to be so large. 题型类（三） Analyses of a language database also confirmed that there was a global change in the sound of world languages after the Neolithic age, with the use of “f” and “v” increasing remarkably during the last few thousand years.These sounds are still not found in the languages of many hunter－gatherer people today. This research overturns the popular view that all human speech sounds were present when human beings evolved around 300，000 years ago. “The set of speech sounds we use has not necessarily remained stable since the appearance of human beings, but rather the huge variety of speech sounds 题型类（三） that we find today is the product of a complex interplay of things like biological change and cultural evolution，” said Steven Moran, a member of th