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阅读下面短文,在空白处填入1个适当的单词或括号内单词的正确形式。 Temperatures are rising and nature is coming to life. After the cold dark nights, we're all happy to welcome spring. Nevertheless, many people feel unusually ___81___ (sleep) during this time when life outdoors is reawakening. The phenomenon known as spring fatigue actually ___82___(exist). It mirrors the fact that we are part of nature's cycle; the lack of light during the wintertime and hormonal (荷尔蒙) changes both leave their mark. If fatigue continues, sufferers should see a doctor to have their blood ___83___(test). Like animals in hibernation, humans lower their body temperature ___84___(slight) in winter, and the lack of light causes them to lead ___85___ more passive lifestyle. When ___86___ gets warmer again outside, the body's temperature also increases, and its metabolism (新陈代谢) and hormone balance adjust ___87___ the new light conditions. All these ___88___(process) can temporarily bring down the energy levels of those likely to be affected by the condition. The best way to avoid this weary feeling is ___89___(watch) your diet, make sure you get sufficient outdoor exercise and of course have enough sleep. Exercising is particularly good in the spring, especially in the morning hours. Endurance sports like jogging or biking stimulate the body's circulation and beat off fatigue. ___90___ is actually recommended all year round can have a positive effect in spring: drink plenty of water and choose light foods rather than heavy meals.