单项选择题

Questions 26-30 are based on the following passage: Now, our biggest summertime question has been answered: Why do people look so much better in sunglasses Vanessa Brown, a senior lecturer of art and design at Nortingham University, gave an inside look into the connection between shades and sex appeal. According to Brown, sunglasses do a wide variety of positive things. They make up for any asymmetries(不对称)，which relates directly to research proving that symmetrical faces are the most attractive ones. If you put on a pair of sunglasses, the lenses will instantly create a perfectly symmetrical face. Sunglasses also create the appearance of a defined bone structure on top of a relatively softer face. Additionally, people often form quick judgments about others by looking into their eyes. Through eye contact ,we can determine someone’s confidence, sincerity and intelligence. If those eyes are shielded, though, a person is automatically unreadable. We take them for granted today, but sunglasses are a relatively modern everyday accessory(饰件). Sales started to pick up in the 1920s, but they didn’t become commonplace until about two decades after that. In their early days, sunglasses were primarily used during risking water and snow sports, and were also associated with new technologies like airplanes travel, which made them seem “daring and thoroughly modern.” Later, Hollywood stars of the 1950s and 60s started wearing sunglasses to defend themselves form being recognized by the public or harassed by paparazii(狗子队). Movie stars’ adoption the accessory strengthened the link between sunglasses and appeal. The passage is mainly written to _______.