【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

9.D【解析】赫尔希和蔡斯以T2噬菌体为实验材料,T2噬菌体仅蛋白质分子中含有硫,而磷绝大部分存在于DNA分子中,D错误

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