20 18, national political topic, please ask top student for help.

From the materials, we can know that not only the traditional culture of China is spreading, but also high-speed rail and online shopping have received responses abroad. We can rule out that ②, ① is wrong and ③ is right, so the change of form lies in the material: Chinese Pinyin is becoming a new phenomenon in English-speaking countries. It can be understood that in the past, the form of cultural exchange between China and foreign countries was mainly the sinicization of English, but this form has gradually changed in the past two years, with the westernization of Chinese pinyin as the main form. Hope to adopt