1. Passage 1 The secret of being born lucky is a summer birthday， with May babies most likely to enjoy a lifetime‘s good fortune， according to a study of more than 40，000 people. The time of year at which you are born has an enduring influence on levels of optimism and self-reported luck， according to a research by British and Swedish scientists. May was the luckiest month in which to be born， with 50 percent of those born then considering themselves lucky， while October was the least lucky month， with just 43 percent claiming good fortune. The findings add to growing evidence that the phenomenon of luck is not all down to chance， but is affected by a person‘s general disposition. Other research has shown that whether people think themselves fortunate depends less on objective success than on having a ―glass half-full‖ or ―half-empty‖ approach to life. ―What we are seeing suggests that something is influencing how people perceive their luckiness. My hypothesis is that people create their own luck by traits such as optimism， that luck is a psychological phenomenon rather than a matter of blind chance，‖ said Professor Richard Wiseman， who led the research. The pattern of the result， with those born in spring and in summer reporting themselves luckier than those born in autumn or winter， could have two potential explanations， Professor Wiseman said. According to the passage， whether people think themselves lucky or not depends on the following factors EXCEPT( ).