The traditional Aodai beauty presented flowers at the airport.

Test analysis: the material in the question "Ao Dai (? Aodai) is a traditional national costume in Vietnam, which is similar to China cheongsam in style, but it also shows the national characteristics of the Vietnamese themselves. It is usually made of silk and is divided into two parts: robes and trousers. Dresses generally split to the waist and are influenced by European and American cultures. " It shows that cultural innovation should face the world and learn from others, so item 2 meets the meaning of the question and can be chosen; The materials in the topic "Appraised by Vietnamese experts as' inspired by the import of cheongsam from China'" show that commercial trade is an important way of cultural communication, so item 3 conforms to the meaning of the topic and can be chosen; This question does not involve the characteristics of China culture, so item 1 is irrelevant and cannot be selected; The fourth statement that "cultural exchange melts the cultural diversity of the world" is wrong, so it cannot be selected. So, the answer is C.