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   Some people don’t like doing sports because they think it is hard work and will make____ (他们) feel tired . That’s wrong! Sports help us to____ (保持)healthy , happy and live longer .If you____ (从不) do sports , you will get unhealthy easily . Sports are____ (也)a good way to make friends .People from different____ (地方) may not know each other , but after a game , they often become good friends .And sports in winter and ____ (夏天)are not the same.____ __(swim) is fun in hot weather , while skiing is great____ cold days . Many people____ (享受) watching others play games .They often get very____ (兴奋) when “their” players or teams win .

生活在英国曼彻斯特地区的桦尺蛾有浅色和深色两种体色，它们都喜欢栖息在树干上．19世纪后期，英国工业革命导致工厂大量排烟，使树干由浅灰色变成黑褐色，桦尺蛾也由浅色常见类型逐渐变成为深色常见类型．请分析回答下列问题．