【考范文】Dear fellow studentsWith the cold and flu season colliding (Rzi) with the COVID. 19 pandemic, how to protect ourselves ismailer of urgency. To combat the flu and other illnesses this season, all students had better do as followsThe single best way to prevent seasonal flu is to get vaccinated, but good health habits like avoidingpeople who are sick, covering your cough and washing your hands of ten can help stop the spread of germsadditionally, it's strongly advised to get enough sleep and reduce stress, which is also of great help.It's high time that we took preventive measures to ensure a sound body and a happy lifeStudent Union

31【答案】(8分,除特殊说明外,每空1分)(1)垂直结构(或空间结构)二氧化碳(2)生物对人类生存环境无污染(减少农药使用量)合理调整能量流动关系,使能量持续高效地流向对人类最有益的部分(2分各1分)3)性别比例(4)光照时间(或光照)

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