【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

30.(1)温度、pH和渗透压(1分)(2)胰高血糖素和肾上腺素(2分)血糖低,脑细胞能量供应不足(2分)(3)体液免疫和细胞(2分)自身免疫病(1分)[(1)内环境的理化性质主要包括温度、pH和渗透压。(2)正常情况下,血糖降低时,会直接刺激胰岛A细胞分泌胰高血糖素,还可刺激下丘脑,通过神经调节,刺激肾上腺分泌肾上腺素,促进肝糖原分解和非糖物质转化,使血糖恢复正常。低血糖症状一般表现为头晕、心慌、四肢无力等,其中头晕的原因是血糖浓度低,脑细胞能量供应不足。(3)某糖尿病患者由胰岛B细胞损伤引起,患者血液中含有抗胰岛B细胞的抗体和效应T细胞,据此推测:胰岛B细胞的损伤是机体通过体液免疫和细胞免疫导致的;这种糖尿病是由于免疫系统攻击自身细胞导致的,故属于免疫异常中的自身免疫病。]

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