So, why could the seasons cause such differences?

　　“Biochemical studies have shown that the season in which you are born affects some monoamine neurotransmitters (单胺类神经递质),” lead researcher Xenia Gonda said in a written statement. “This led us to believe that birth season may have a longer-lasting effect.”

　　Monoamine neurotransmitters are given off from neurones (神经元细胞). They affect our emotions. So the researchers believe they might have an effect on the development of our personalities.

　　Different seasons also have different food and nutrients (养分) to offer. In addition, mothers usually get more physical exercise and enjoy more sunlight in warm seasons than in cold seasons. All these are “environmental factors ” which may influence a person’s personality, said Gonda.

　　But the research only included a survey and didn’t follow participants over time. More research is needed before a final answer can be given on the connection between season and personality.

　　Don’t worry, though. Even if the connection is proven, it won’t mean that your birth month completely decides who you are. Being happy or sad is up to you.

　　25.The study from Semmelweis University in Hungary intended to prove that _________________.

　　A. a person’s birth season might affect their monoamine neurotransmitters

　　B. monoamine neurotransmitters might be connected to our emotions

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