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 Nottingham Trent 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 risky water and snow sports, and were also associated with new technologies like airplane travel, which made them seem "daring and thoroughly modern". Later Hollywood stars of the 1950s and 60s started wearing sunglasses to defend themselves from being recognized by the public or harassed by paparazzi(狗仔队). Movie stars" adoption of the accessory strengthened the link between sunglasses and appeal.

单选题 Sunglasses make us look appealing by______.

单选题 According to Paragraph 3, people in sunglasses would look______.

单选题 Sunglasses began to be popular in the______.

单选题 The example of sportsmen shows that______.

单选题 The passage is mainly written to______.